SA56004ADP_技术文档

INTEGRATED CIRCUITS

SA56004X

±1 °C accurate, SMBus-compatible, 8-pin,

remote/local digital temperature sensor

with over temperature alarms

Product data sheet

2004 Oct 06

Supersedes data of 2003 Sep 03

Philips

Semiconductors

Philips Semiconductors

Product data sheet

±1 °C accurate, SMBus-compatible, 8-pin, remote/local

digital temperature sensor with over temperature alarms

SA56004X

GENERAL DESCRIPTION

The Philips SA56004X is an SMBus compatible, 11-bit remote/local

digital temperature sensor with over temperature alarms. The

remote channel of the SA56004 monitors a diode junction, such as a

substrate PNP of a microprocessor or a diode connected transistor

such as the 2N3904 (NPN) or 2N3906 (PNP). With factory trimming,

remote sensor accuracy of ±1°C is achieved.

Under and over temperature alert thresholds can be programmed to

cause the ALERT output to indicate when the on-chip or remote

temperature is out of range. This output may be used as a system

interrupt or SMBus alert. The T_CRIT output is activated when the

on-chip or remote temperature measurement rises above the

programmed T_CRIT threshold register value. This output may be

used to activate a cooling fan, send a warning or trigger a system

shutdown. To further enhance system reliability, the SA56004X

employs an SMBus time-out protocol. The SA56004X has a unique

device architecture which is patented (U.S. patent #6542020).

The SA56004X is available in the SO8 and TSSOP8 packages.

SA56004X has 8 factory-programmed, device address options.

The SA56004X is pin-compatible with the LM86, MAX6657/8, and

ADM1032.

SO8

TSSOP8

Patents

Notice is herewith given that the subject device uses one or more of

the following patents and that each of these patents may have

corresponding patents in other jurisdictions:

Patent No. US 6,542,020 B2 — owned by Koninklijke Philips

Electronics N.V., Eindhoven (NL).

2

• I C-bus standard and fast mode compatible

FEATURES

• Accurately senses temperature of remote microprocessor thermal

• TSSOP8 and SO8 packages

diodes or diode connected transistors within ±1 °C

• Programmable conversion rate (0.0625 Hz to 26 Hz)

• On-chip local temperature sensing

• 11-bit, 0.125 °C resolution

• 8 different device addresses are available for server applications.

The SA56004ED/EDP with marking code 56004E/600E is

address compatible with the National LM86, the MAX6657/8 and

the ADM1032.

• Undervoltage lockout prevents erroneous temperature readings

• Latch-up testing is done to JESDEC Standard JESD78 which

exceeds 100 mA

APPLICATIONS

• System thermal management in laptops, desktops, servers and

• Offset registers available for adjusting the remote temperature

workstations

accuracy

• Computers and office electronic equipment

• Electronic test equipment & instrumentation

• HVAC

• Programmable under/overtemperature alarms: ALERT and T_CRIT

• SMBus 2.0 compatible interface, supports TIMEOUT

• Operating voltage range: 3.0 V to 3.6 V

• Industrial controllers and embedded systems

2

2004 Oct 06

Philips Semiconductors

Product data sheet

±1 °C accurate, SMBus-compatible, 8-pin, remote/local

digital temperature sensor with over temperature alarms

SA56004X

SIMPLIFIED SYSTEM DIAGRAM

V

DD

R

10 kΩ

R

10 kΩ

R

10 kΩ

V

DD

SHIELDED TWISTED PAIR

1

2

3

4

8

7

6

5

SCLK

CLOCK

DATA

INT

V

DD

100 nF

D+

SDATA

SMBus

CONTROLLER

2.2 nF

(Note 1)

SA56004X

REMOTE

SENSOR

2N3904 (NPN), 2N3906 (PNP),

or similar standalone, ASIC, or

mircroprocessor thermal diode

D–

ALERT

V

DD

GND

R

10 kΩ

T_CRIT

GND

+5 V

FAN CONTROL

CIRCUIT

SL02018

NOTE:

1. Typical value; placed close to temperature sensor.

Figure 1. Simplified system diagram.

ORDERING INFORMATION

PACKAGE

TEMPERATURE

RANGE

TYPE NUMBER

VERSION

NAME

SO8

DESCRIPTION

plastic small outline package; 8 leads; body width 3.9 mm

plastic thin shrink small outline package; 8 leads; body width 3 mm

SA56004XD

SOT96-1

0 °C to +125 °C

SA56004XDP

TSSOP8

SOT505-1

NOTE:

There are 8 device slave address options (indicated by ‘X’ in the Type Number, and described in Table 1).

Table 1. Device slave address options

1

Part number

Marking code

Device slave address

Part number

Marking code

Device slave address

2

SA56004AD

SA56004ADP

56004A

6004A

SA56004ED

56004E

6004E

1001000

1001100

1001101

1001110

1001111

2

SA56004EDP

SA56004BD

SA56004BDP

56004B

6004B

SA56004FD

56004F

6004F

1001001

1001010

1001011

SA56004FDP

SA56004CD

SA56004CDP

56004C

6004C

SA56004GD

SA56004GDP

56004G

6004G

SA56004DD

SA56004DDP

56004D

6004D

SA56004HD

SA56004HDP

56004H

6004H

NOTES:

1. The device slave address is factory-programmed in OTP device address register.

2. The SA56004ED/EDP has the bus address of the National LM86, MAX6657/8 and the ADM1032.

3

2004 Oct 06

Philips Semiconductors

Product data sheet

±1 °C accurate, SMBus-compatible, 8-pin, remote/local

digital temperature sensor with over temperature alarms

SA56004X

PIN CONFIGURATION

PIN DESCRIPTION

PIN SYMBOL

DESCRIPTION

SO8 and TSSOP8

TOP VIEW

1

V

Positive supply voltage. DC voltage from 3.0 V

to 5.5 V.

DD

V

1

2

3

4

8

7

6

5

SCLK

SDATA

ALERT

GND

DD

2

3

4

D+

Diode current source (anode).

Diode sink current (cathode).

D+

D–

SA56004X

T_CRIT

T_CRIT alarm is open drain, active-LOW output

which requires an external pull-up resistor. It

functions as a system interrupt or power

shutdown.

T_CRIT

SL02014

5

6

GND

Power supply ground.

Figure 2. Pin configuration.

ALERT

ALERT alarm is an open drain, active-LOW

output which requires an external pull-up resistor.

It functions as an interrupt indicating that the

temperature of the on-chip or remote diode is

above or below programmed over temperature

or under temperature thresholds.

2

7

8

SDATA

SCLK

SMBus/I C-bus bi-directional data line. This is

an open drain output which requires an external

pull-up resistor.

2

SMBus/I C-bus clock input which requires an

external pull-up resistor.

MAXIMUM RATINGS

All voltages are referenced to GND.

SYMBOL

PARAMETER

MIN.

–0.3

–1

MAX.

+6

UNIT

V

DD

Supply voltage

Voltage at SDATA, SCLK, ALERT, T_CRIT

Voltage at Positive diode input

+6

V

+ 0.3

V

D+

DD

Voltage at Negative diode input

Sink current at SDATA, SCLK, ALERT, T_CRIT

D+ input current

+0.8

V

D–

50

1

mA

mW

V

I

D+

–1

SO8 package (derate 5.9 mW/°C above T

= 70 °C)

–

471

664

2000

200

+150

+165

P

D

Power dissipation

amb

TSSOP8 package (derate 8.3 mW/°C above T

= 70 °C)

–

amb

Human Body Model (Note 1)

Machine Model (Note 1)

–

V

esd

ESD

–

V

T

j(max)

Maximum junction temperature

Storage temperature range

–

°C

T

stg

–65

NOTES:

1. The D+ and D– pins are 1000 V HBM and 100 V MM due to the higher sensitivity of the analog pins that introduces a limitation to the circuit

protection structure.

4

2004 Oct 06

Philips Semiconductors

Product data sheet

±1 °C accurate, SMBus-compatible, 8-pin, remote/local

digital temperature sensor with over temperature alarms

SA56004X

ELECTRICAL CHARACTERISTICS

T

amb

= 0 °C to +125 °C, V = 3.0 V to 3.6 V, unless otherwise specified.

DD

SYMBOL

PARAMETER

CONDITIONS

= 60 °C to +100 °C

MIN.

–2

–3

–1

–3

–

TYP.

±1

MAX.

+2

+3

+1

+3

–

UNIT

°C

T

ERRL

Local temperature error

amb

T

amb

= 0 °C to +125 °C

–

°C

T

amb

= +25 °C to +85 °C; T = +60 °C to +100 °C

–

°C

T

ERRR

Remote temperature error

Remote temperature resolution

Local temperature resolution

Conversion time

RD

T

amb

= 0 °C to +85 °C; T = 0 °C to +125 °C

–

°C

RD

11

bits

°C

T

RESR

–

0.125

11

–

bits

°C

RESL

–

0.125

38

–

t

–

ms

V

CONV

1

V

DD

Supply voltage

3.0

–

5.5

–

Quiescent current

During conversion, 16 Hz conversion rate

SMBus inactive

500

10

µA

V

I

DD

Shutdown current

–

High setting: D+ – D– = +0.65 V

–

160

10

–

I

Remote diode source current

RD

Low setting

–

3

UVL

Undervoltage lockout (UVL)

V

input disables A/D conversion

2.6

–

2.95

DD

2

threshold voltage

4

Power-on-Reset (POR) threshold

voltage

V

, input falling edge

1.8

–

2.4

–

V

DD

Local and Remote ALERT HIGH

default temperature settings

Default values set at power-up

Default value set at power-up

+70

0

°C

Local and Remote ALERT LOW

default temperature settings

–

Local and Remote T_CRIT

default temperature settings

–

+85

–

Hystersis (T_CRIT)

–

+10

–

°C

ALERT and T_CRIT output

saturation voltage

I

= 6.0 mA

0.4

V

OUT

NOTES:

1. The SA56004X is optimized for 3.3 V operation.

DD

2. Definition of Under Voltage Lockout (UVL): The value of V below which the internal A/D converter is disabled. This is designed to be a

DD

minimum of 200 mV above the power-on-reset. During the time that it is disabled, the temperature that is in the “read temperature registers”

will remain at the value that it was before the A/D was disabled. This is done to eliminate the possibility of reading unexpected false

temperatures due to the A/D converter not working correctly due to low voltage. In case of power-up (rising V ), the reading that is stored

DD

in the “read temperature registers” will be the default value of 0 °C. V will rise to the value of the UVL, at which point the A/D will function

DD

correctly and the normal temperature will be read.

3. V (rising edge) voltage below which the A/D converter is disabled.

DD

4. V (falling edge) voltage below which the logic is reset.

DD

5

2004 Oct 06

Philips Semiconductors

Product data sheet

±1 °C accurate, SMBus-compatible, 8-pin, remote/local

digital temperature sensor with over temperature alarms

SA56004X

SMBus INTERFACE AC ELECTRICAL CHARACTERISTICS

V

DD

= 3.0 V to 3.6 V; T

= 0 °C to +125 °C; unless otherwise noted.

amb

These specifications are guaranteed by design and not tested in production.

SYMBOL

PARAMETER

CONDITIONS

= 2.7 V to 5.5 V

MIN.

2.2

–

TYP.

MAX.

–

UNIT

V

Logic input HIGH voltage for SCLK, SDATA

Logic input LOW voltage for SCLK, SDATA

Logic output LOW sink current

V

–

5

IH

IL

DD

V

= 2.7 V to 5.5 V

0.8

–

V

DD

I

OL

ALERT, T_CRIT; V = 0.4 V

1.0

6.0

–

mA

µA

pF

OL

SDATA; V = 0.6 V

–

OL

I

Logic output high leakage current

Logic input currents

V

= V

DD

1.0

–

OH

, I

IH IL

= V or GND

–1.0

–

IN

DD

C

SMBus input capacitance for SCLK, SDATA

i

SMBus digital switching characteristics

The switching characteristics of the SA56004X fully meet or exceed all parameters specified in SMBus version 2.0. The following parameters

specify the timing between the SCLK and SDATA signals in the SA56004X. They adhere to, but are not necessarily specified as the SMBus

specifications.

f

t

SCLK operating frequency

SCLK LOW time

–

400

–

kHz

µs

SCLK

LOW

HIGH

BUF

10% to 10%

90% to 90%

4.7

4.0

4.7

5.0

–

SCLK HIGH time

–

µs

SMBus free time.

–

µs

Delay from SDATA stop to SDATA start

t

Hold time of start condition.

Delay from SDATA start to first SCLK H-L

10% of SDATA to 90% of SCLK

4.0

–

300

–

µs

ns

µs

HD:STA

HD:DAT

SU:DAT

SU:STA

SU:STO

Hold time of data.

Delay from SCLK H-L to SDATA edges

Set-up time of data in.

Delay from SDATA edges to SCLK L-H

250

4.0

Set-up time of repeat start condition.

Delay from SCLK L-H to restart SDATA

90% to to 90%

–

Set-up time of stop condition.

90% of SCLK to 90% of SDATA

–

Delay from SCLK H-L to SDATA stop

t

Rise time of SCLK and SDATA

Fall time of SCLK and SDATA

Output fall time

–

1

µs

ns

R

300

250

35

F

C = 400 pF; I = 3 mA

–

ns

OF

L

O

SMBus TIMEOUT.

25

ms

TIMEOUT

Low period for reset of SMBus

t

R

t

LOW

t

F

HD:STA

SCLK

t

HIGH

t

HD:STA

SU:STO

t

SU:STA

t

HD:DAT

SU:DAT

SDATA

t

BUF

P

S

P

SL01204

Figure 3. Timing measurements.

6

2004 Oct 06

Philips Semiconductors

Product data sheet

±1 °C accurate, SMBus-compatible, 8-pin, remote/local

digital temperature sensor with over temperature alarms

SA56004X

PERFORMANCE CURVES

20

700

16

12

600

500

V

= 5.5 V

V

DD

V

= 5.5 V

DD

= 3.3 V

DD

V

= 3.6 V

DD

V

= 3.6 V

V

= 3.3 V

DD

V

= 3.0 V

DD

8

400

V

= 3.0 V

DD

4

0

300

200

–50

–25

0

25

50

75

100

125

SL02164

–50

–25

0

25

50

75

100

125

SL02158

TEMPERATURE (°C)

Figure 4. Typical I shutdown versus

Figure 6. Typical I quiescent current versus

DD

temperature and V

temperature and V (conversion rate = 16 Hz)

DD

400

500

16 Hz

350

300

400

300

V

= 5.5 V

V

CC

8.0 Hz

0.5 Hz

1.0 Hz

250

200

0.25 Hz

V

= 3.3 V

CC

= 3.6 V

= 3.0 V

4.0 Hz

2.0 Hz

CC

200

100

V

CC

150

100

0.12 Hz

0.06 Hz

–50

–25

0

25

50

75

100

125

SL02157

–50

–25

0

25

50

75

100

125

SL02159

TEMPERATURE (°C)

Figure 5. Typical I quiescent current versus

Figure 7. Typical I quiescent current versus

DD

temperature and V (conversion rate = 0.06 Hz)

temperature and conversion rate (V = 3.3 V)

DD

7

2004 Oct 06

Philips Semiconductors

Product data sheet

±1 °C accurate, SMBus-compatible, 8-pin, remote/local

digital temperature sensor with over temperature alarms

SA56004X

14

2.80

2.79

2.78

2.77

2.76

12

10

V

= 5.5 V

= 3.3 V

CC

V

= 5.5 V

CC

V

= 3.6 V

CC

8

6

2.75

2.74

V

= 3.0 V

CC

V

= 3.6 V

CC

2.73

2.72

V

= 3.0 V

CC

V

0

= 3.3 V

CC

4

2

2.71

2.70

–50

–25

25

50

75

100

125

SL02160

–50

–25

0

25

50

75

100

125

SL02162

TEMPERATURE (°C)

Figure 8. Typical T_CRIT I versus temperature and V

Figure 10. Typical UVL versus temperature and V

DD

OL

DD

(V = 0.4 V)

OL

10

2.6

2.4

2.2

2.0

1.8

9

8

V

= 5.5 V

CC

V

= 3.6 V

CC

7

6

V

= 3.0 V

CC

1.6

1.4

V

= 3.3 V

CC

5

4

1.2

1.0

–50

–25

0

25

50

75

100

125

SL02161

–50

–25

0

25

50

75

100

125

SL02163

TEMPERATURE (°C)

Figure 9. Typical ALERT I versus temperature and V

Figure 11. Typical POR versus temperature

OL

DD

(V = 0.4 V)

OL

8

2004 Oct 06

Philips Semiconductors

Product data sheet

±1 °C accurate, SMBus-compatible, 8-pin, remote/local

digital temperature sensor with over temperature alarms

SA56004X

BLOCK DIAGRAM

SA56004X

ONE-SHOT

REGISTER

V

DD

CONFIGURATION

REGISTER

COMMAND

REGISTER

LOCAL

TEMP

SENSOR

REMOTE OFFSET

REGISTER

CONTROL

LOGIC

LOCAL HIGH TEMP

THRESHOLD

LOCAL TEMP HIGH

LIMIT REG

CONVERSION

REGISTER

LOCAL LOW TEMP

THRESHOLD

LOCAL TEMP LOW

LIMIT REGISTER

LOCAL TEMP

DATA REGISTER

11-BIT

Σ–∆

LOCAL

REMOTE

MUX

D+

D–

A–to–D

REMOTE TEMP

DATA REGISTER

REMOTE HIGH

TEMP THRESHOLD

REMOTE TEMP

HIGH LIMIT REG

CONVERTER

T_CRIT

HYSTERESIS

REMOTE LOW

TEMP THRESHOLD

REMOTE TEMP

LOW LIMIT REG

ALERT

IINTERRUPT

STATUS REGISTER

GND

OTP DEVICE

ADDRESS REGISTER

SMBus INTERFACE

T_CRIT

INTERRUPT

SDATA

SCLK

SL02015

Figure 12. Functional block diagram.

9

2004 Oct 06

Philips Semiconductors

Product data sheet

±1 °C accurate, SMBus-compatible, 8-pin, remote/local

digital temperature sensor with over temperature alarms

SA56004X

FUNCTIONAL DESCRIPTION

Register overview

The SA56004X contains three types of SMBus addressable registers.

These are read only (R), write only (W), and read-write (R/W).

Attempting to write to any R-only register or read data from any

W-only register will produce an invalid result. Some of the R/W

registers have separate addresses for reading and writing operations.

Serial bus interface

The SA56004X should be connected to a compatible two-wire serial

interface System Management Bus (SMBus) as a slave device

using the two device terminals SCLK and SDATA. The ALERT pin

can optionally be used with the SMBus protocol to implement the

ARA response. The controller will provide a clock signal to the

device SCLK pin and write/read data to/from the device through the

device SDATA pin. External pull-up resistors, about 10 kΩ each, are

needed for these device pins due to open drain circuitry.

The registers of the SA56004X serve four purposes:

• Control and configuration of the SA56004X

• Status reporting

• Temperature measurement storage

• ID and manufacturer test registers.

Data of 8-bit digital byte or word are used for communication

between the controller and the device using SMBus 2.0 protocols

which are described more in the ‘SMBus Interface’ section on

page 17. The operation of the device to the bus is described with

details in the following sections.

Table 2 describes the names, addresses, power-on-reset (POR),

and functions of each register. The data of the temperature-related

registers is in 2’s complement format in which the MSB is the sign

bit. The 8-bit data of other registers is in 8-bit straight format.

Slave address

The SA56004X has a 7-bit slave address register which is factory

programmed in OTP memory. Eight unique devices are available

with different slave addresses as defined in the ‘Ordering

information’ section in Table 1, ‘Device slave address options’. Up to

eight devices can reside on the same SMBus without conflict,

provided that their addresses are unique.

Table 2. Register assignments

REGISTER

NAME

POR

STATE

FUNCTION

BITS

ACCESSIBILITY

COMMAND BYTE

READ WRITE

ADDRESS ADDRESS

LTHB

RTHB

SR

00h

01h

02h

03h

04h

05h

06h

07h

08h

NA

0000 0000

1000

Local Temperature HIGH Byte

Remote Temperature HIGH Byte

Status Register

8

R

8

R

NA

8

R

CON

09h

0Ah

0Bh

0Ch

0Dh

0Eh

0Fh

NA

Configuration Register

8

R/W

W

CR

Conversion Rate

4

LHS

0100 0110

0000 0000

0100 0110

0000 0000

Local HIGH Setpoint

8

LLS

Local LOW Setpoint

8

RHSHB

RLSHB

One Shot

RTLB

RTOHB

RTOLB

RHSLB

RLSLB

RCS

Remote HIGH Setpoint High Byte

Remote LOW Setpoint High Byte

Writing register initiate a one shot conversion

Remote Temperature LOW Byte

Remote Temperature Offset High Byte

Remote Temperature Offset Low Byte

Remote HIGH Setpoint Low Byte

Remote LOW Setpoint Low Byte

Remote T_CRIT Setpoint

RLocal T_CRIT Setpoint

8

0

10h

11h

12h

13h

14h

19h

20h

21h

22h

BFh

FEh

FFh

0000 00

0000 0000

000

6(MSBs)

R

11h

12h

13h

14h

19h

20h

21h

NA

8

R/W

R

3(MSBs)

000

3(MSBs)

000

3(MSBs)

0101 0101

0 1010

8

LCS

8

TH

T_CRIT Hysteresis

5

LTLB

AM

0000 0000

0

Local Temperature Low Byte

Alert Mode

3(MSBs)

BFh

NA

1

8

R/W

R

RMID

RDR

1010 0001

0000 0000

Read Manufacturer’s ID

NA

Read Stepping or Die Revision

R

10

2004 Oct 06

Philips Semiconductors

Product data sheet

±1 °C accurate, SMBus-compatible, 8-pin, remote/local

digital temperature sensor with over temperature alarms

SA56004X

Power-on-reset (POR)

Temperature data format

When power is applied to the SA56004X, the device will enter into

its power-on-reset state and its registers are reset to their default

values. The configuration, status, and temperature-reading registers

remain in these states until after the first conversion. As shown in

Table 2, this results in:

The temperature data can only be read from the Local and Remote

Temperature registers; the setpoint registers (e.g. T_CRIT, LOW,

HIGH) are read/write.

Both local and remote temperature reading data is represented by

an 11-bit, 2’s complement word with the LSB (Least Significant

Bit) = 0.125 °C. The temperature setpoint data for the remote

channel is also represented by an 11-bit, 2’s complement word with

the LSB = 0.125 °C. The temperature setpoint data for both the local

channel and the T_CRIT setpoints are represented by 8-bit, 2’s

complement words with the LSB = 1.0 °C. For 11-bit temp data, the

data format is a left justified, 16-bit word available in two 8-bit

registers (high byte and low byte). For 8-bit temp data, the data is

available in a single 8-bit register (high byte only).

1. Command register set to 00h.

2. Local Temperature register (LTHB and LTLB) set to 0 °C.

3. Remote Diode Temperature register (RTHB and RTLB) set to

0 °C until the end of the first conversion.

4. Status register (SR) set to 00h.

5. Configuration register (CON) set to 00h; Interrupt latches are

cleared, the ALERT and T_CRIT output drivers are off and the

ALERT and T_CRIT pins are pulled HIGH by the external pull-up

resistors.

Table 3. Temperature data format

TEMPERATURE

DIGITAL OUTPUT

BINARY

6. Local T_CRIT temperature setpoints (LCS) and Remote T_CRIT

temperature setpoints (RCS) at 85 °C.

HEX

7. Local HIGH setpoint (LHS) and remote HIGH temperature

+125 °C

+25 °C

+1 °C

0111 1101 0000 0000

7D00h

1900h

0100h

0020h

0000h

FFE0h

FF00h

E700h

C900h

setpoint (RHSHB) at 70 °C.

0001 1001 0000 0000

0000 0001 0000 0000

0000 0000 0010 0000

0000 0000 0000 0000

1111 1111 1110 0000

1111 1111 0000 0000

1110 0111 0000 0000

1100 1001 0000 0000

8. Local LOW setpoint (LLS) and Remote LOW temperature

setpoints (RLSHB) at 0 °C.

+0.125 °C

0 °C

9. Conversion Rate register (CR) is set to 8h; the default value of

about 16 conversions/s.

–0.125 °C

–1 °C

Starting conversion

Upon POR, the RUN/STOP bit 6 of the configuration register is zero

(default condition), then, the device will enter into its free-running

operation mode in which the device A/D converter is enabled and

the measurement function is activated. In this mode, the device

cycles the measurements of the local and remote temperature

automatically and periodically. The conversion rate is defined by the

programmable conversion rate stored in the conversion rate register.

It also performs comparison between readings and limits of the

temperature in order to set the flags and interruption accordingly at

the end of every conversion. Measured values are stored in the

temp registers, results of the limit comparisons are reflected by the

status of the flag bits in the status register and the interruption is

reflected by the logical level of the ALERT and T_CRIT output. If the

power-on temperature limit is not suitable, the temp limit values

could be written into the limit registers during the busy-conversion

duration of about 38 ms of the first conversion after power-up.

Otherwise, the status register must be read and the configuration

bit 7 must be reset in order to recover the device from interruption

caused by the undesired temp limits.

–25 °C

–55 °C

Low power software standby mode

The device can be placed in a software standby mode by setting the

RUN/STOP bit 6 in the configuration register HIGH (to 1). In

standby, the free-running oscillator is stopped, the supply current is

less than 10 µA if there is no SMBus activity, all data in the registers

is retained. However, the SMBus is still active and reading and

writing registers can still be performed. A one-shot command will

initiate a single conversion which has the same effect as any

conversion that occurs when the device is in its free-running mode.

To restore the device to free running mode, set the RUN/STOP bit 6

LOW (to 0).

11

2004 Oct 06

Philips Semiconductors

Product data sheet

±1 °C accurate, SMBus-compatible, 8-pin, remote/local

digital temperature sensor with over temperature alarms

SA56004X

SA56004 SMBus REGISTERS

Table 5. Configuration Register (CON)

bit assignments

Name/Function

ALERT mask

The ALERT interrupt is enabled when this bit is

LOW. The ALERT interrupt is disabled

(masked) when this bit is HIGH.

Command Register

POR

state

The command register selects which register will be read or written

to. Data for this register should be transmitted during the Command

Byte of the SMBus write communication.

Bit

7

0

(MSB)

Local and Remote Temperature registers

(LTHB, LTLB, RTHB, RTLB)

6

RUN/STOP

0

Table 4. Local and Remote Temperature registers

bit assignment

High Byte (Read only address 00h, 01h)

Standby or run mode control: Running mode is

enabled when this bit is LOW. The SA56004X

is in standby mode when this bit is HIGH.

5

4

Not defined. Defaults to “0” (zero).

Remote T_CRIT mask

0

Bit

D7

D6

D5

D4

D3

D2

D1

D0

Value Sign

64

32

16

8

4

2

1

The T_CRIT output will be activated by a

remote temperature that exceeds the remote

T_CRIT setpoint when this bit is LOW. The

T_CRIT output will not be activated under this

condition when this bit is HIGH.

Low Byte (Read only address 10h)

Bit

D7

D6

D5

D4

D3

D2

D1

D0

Value 0.5

0.25 0.125

0

3

2

Not defined. Defaults to “0” (zero).

0

Configuration register

Local T_CRIT mask

The configuration register is an 8-bit register with read address 03h

and write address 09h. Table 5 shows how the bits in this register

are used.

The T_CRIT output will be activated by a local

temperature that exceeds the local T_CRIT

setpoint when this bit is LOW. The T_CRIT

output will not be activated under this condition

when this bit is HIGH.

1

0

Not defined. Defaults to “0” (zero).

0

Fault Queue

A single remote temperature measurement

outside the HIGH, LOW or T_CRIT setpoints

will trigger an outside limit condition resulting in

setting the status bits and associated output

pins when this bit is LOW. Three consecutive

measurements outside of one of these

setpoints are required to trigger an outside of

limit condition when this bit is HIGH.

Status register

The contents of the status register reflects condition status resulting

from all activities: comparison between temperature measurements

and temperature limits, the status of A/D conversion, and the

hardware condition of external diode to the device. Bit assignments

are listed in Table 6. This register is read only and its address is 02h.

Upon POR, all bits are set to zero.

Note: any one of the fault conditions, with the exceptions of Diode

OPEN and A/D BUSY, introduces an Alert interrupt (see Alert

interrupt section on page 14). Also, whenever a one-shot command

is executed, the status byte should be read after the conversion is

completed, which is about 38 ms (1 conversion time period) after the

one-shot command is sent.

12

2004 Oct 06

Philips Semiconductors

Product data sheet

±1 °C accurate, SMBus-compatible, 8-pin, remote/local

digital temperature sensor with over temperature alarms

SA56004X

Table 6. Status Register (SR) bit assignment

Temperature limit registers

Read only address 02h

Table 8. Local and Remote HIGH Setpoint registers

(LHS, RHSHB, and RHSLB)

High Byte (Read only address 05h, 07h / Write address 0Bh, 0Dh)

POR

state

Bit

Name/Function

7

BUSY

n/a

Bit

D7

D6

D5

D4

D3

D2

D1

D0

When ‘1’ A/D is busy converting.

Value Sign

64

32

16

8

4

2

1

6

5

4

LHIGH

0

POR default = LHS = RHSHV = 46h (70 °C).

When ‘1’ indicates Local HIGH temperature alarm.

Low Byte (Read/Write address 13h)

LLOW

0

Bit

Value 0.5

POR default RHSLB = 00h.

D7

D6

D5

D4

D3

D2

D1

D0

When ‘1’ indicates a Local LOW temperature alarm.

RHIGH

0.25 0.125

0

When ‘1’ indicates a Remote Diode HIGH

temperature alarm.

Table 9. Local and Remote LOW Setpoint registers

3

RLOW

0

(LLS, RLSHB, and RLSLB)

High Byte (Read address 06h, 08h / Write address 0Ch, 0Eh)

When ‘1’ indicates a Remote Diode LOW

temperature alarm.

Bit

D7

D6

D5

D4

D3

D2

D1

D0

2

1

OPEN

0

Value Sign

64

32

16

8

4

2

1

When ‘1’ indicates a Remote Diode disconnect.

RCRIT

POR default LLS = RLSHB = 00h.

When ‘1’ indicates a Remote Diode Critical

Temperature alarm.

Low Byte (Read/Write address 14h)

Bit

Value 0.5

POR default RLSLB = 00h (0 °C).

D7

D6

D5

D4

D3

D2

D1

D0

0

LCRIT

0

0.25 0.125

0

When ‘1’ indicates a Local Critical Temperature

alarm.

Table 10. Local and Remote T_CRIT registers

(LCS and RCS)

Single High Byte (Read/Write address 20h, 19h)

Conversion rate register

The conversion rate register is used to store programmable

conversion data, which defines the time interval between

Bit

D7

D6

D5

D4

D3

D2

D1

D0

Value Sign

64

32

16

8

4

2

1

conversions in the standard free-running auto convert mode. Table 7

shows all applicable data values and rates for the SA56004X. Only

the 4 LSBs of the register are used and the other bits are reserved

for future use. The register is R/W using the read address 04h and

write address 0Ah. The POR default conversion data is 08h.

POR default LCS = RCS = 55h (85 °C).

Table 11. T_CRIT Hysteresis register (TH)

Single High Byte (Read and Write address 21h)

Table 7. Conversion rate control byte (CR)

Bit

D7

D6

D5

D4

D3

D2

D1

D0

Data value

00h

Conversion rate (Hz)

Value

–

16

8

4

2

1

POR default TH = 0Ah (10 °C).

0.06

0.12

0.25

0.50

1.0

2

01h

02h

03h

04h

05h

06h

4

07h

8

08h

16

09h

32

0Ah to FFh

n/a

13

2004 Oct 06

Philips Semiconductors

Product data sheet

±1 °C accurate, SMBus-compatible, 8-pin, remote/local

digital temperature sensor with over temperature alarms

SA56004X

register, other than the BUSY (D7) and OPEN (D2), will cause the

ALERT output pin to be active-LOW. An alert will be triggered after

any conversion cycle that finds the temperature is out of the limits

defined by the setpoint registers. In order to trigger an ALERT in all

alert modes, the ALERT mask bit 7 of the Configuration register

must be cleared (not HIGH).

Programmable offset register (remote only)

Table 12. Remote Temperature Offset registers

(RTOHB and RTOLB)

High Byte (Read/Write address 11h)

Bit

D7

D6

D5

D4

D3

D2

D1

D0

ALERT output in Comparator Mode

Value Sign

64

32

16

8

4

2

1

When operating the SA56004X in a system that utilizes a SMBus

controller not having an interrupt, the ALERT output may be

operated as a temperature comparator. In this mode, when the

condition that triggered the ALERT to be asserted is no longer

present, the ALERT output is released as it goes HIGH. In order to

use the ALERT output as a temperature comparator, bit D0, the

ALERT configure bit, in the ALERT Mode (AM) register must be set

HIGH. This is not the POR default.

POR default RTOHB = RTOLB = 00h.

Low Byte (Read/Write address 12h)

Bit

D7

D6

D5

D4

D3

D2

D1

D0

Value 0.5

0.25 0.125

0

POR default RTOLB = 00h.

ALERT mode register

ALERT output in Interrupt Mode

In the interrupt mode, the ALERT output is used to provide an

interrupt signal that remains asserted until the interrupt service

routine has elapsed. In the interrupt operating mode, a read of the

Status register will set the ALERT mask bit 7 of the Configuration

register if any of the temperature alarm bits of the status register is

set with exception of BUSY (D7) and OPEN (D2). This protocol

prevents further ALERT output triggering until the master device has

reset the ALERT mask bit at the end of the interrupt service routine.

The Status register bits are cleared only upon a read of the status

register by the serial bus master (See Figure 13). In order for the

ALERT output to be used as an interrupt, the ALERT Configure bit

D0 of the ALERT Mode (AM) register must be set LOW. Note, this is

the POR default.

Table 13. ALERT mode register (AM)

(Read and Write address BFh)

Bit

D7 D6 D5 D4 D3 D2 D1

D0

ALERT mode

Value

0

D7-D1: is not defined and defaults to ‘0’.

D0: The ALERT output is in Interrupt mode when this bit is LOW.

The ALERT output is in comparator mode when this bit is HIGH.

Other registers

The Manufacturers ID register has a default value A1h (1010 0001)

and a read address FEh.

The Die Revision Code register has a default value 00h

(0000 0000) and read address FFh. This register will increment by 1

every time there is a revision to the die.

Remote Temp

High Limit

One-shot register

The one-shot register is used to initiate a single conversion and

comparison cycle when the device is in the standby mode; upon

completion of the single conversion cycle the device returns to the

standby mode. It is not a data register; it is the write operation that

causes the one-shot conversion. The data written to this register is

not stored; a FF value will always be read from this register. To

initiate an one-shot operation, send a standard write command with

the command byte of 0Fh (One-Shot Write Address).

Remote

Diode Temp

SA56004–X

ALERT pin

Status Register

Bit 4(RHIGH)

A

B,C

D

E, F

INTERRUPTION LOGIC

SR02502

FUNCTIONAL DESCRIPTION

Figure 13. ALERT output in Interrupt Mode

ALERT output

The ALERT output is used to signal Alert interruptions from the

device to the SMBus or other system interrupt handler and it is

active LOW. Because this is an open drain output, a pull-up resistor

The following events summarizes the ALERT output interrupt mode

of operation:

Event A: Master senses ALERT output being active-LOW.

(typically 10 kΩ) to V is required. Several slave devices can share

DD

a common interrupt line on the same SMBus.

Event B: Master reads the SA56004X Status register to determine

what cause the ALERT interrupt.

The ALERT function is very versatile and accommodates three

separate operating modes: 1) a temperature comparator, 2) a

system interrupt based on temperature, and 3) an SMBus Alert

Response Address (ARA) response. The ARA and interrupt modes

are different only in how the user interacts with the SA56004X.

Event C: SA56004X clears the Status register, resets the ALERT

output HIGH, and sets the ALERT mask bit 7 in the Configuration

register.

Event D: A new conversion result indicates the temperature is still

above the high limit, however the ALERT pin is not activated due to

the ALERT mask.

At the end of every temperature reading, digital comparators

determine if the readings are above the HIGH or T_CRIT setpoint or

below the LOW setpoint register values. If so, the corresponding bit

in the Status register is set. If the ALERT mask bit 7 of the

Configuration register is not HIGH, then, any bit set in the Status

14

2004 Oct 06

Philips Semiconductors

Product data sheet

±1 °C accurate, SMBus-compatible, 8-pin, remote/local

digital temperature sensor with over temperature alarms

SA56004X

Event E: Master should correct the conditions that caused the

ALERT output to be triggered. For instance, the fan is started,

setpoint levels are adjusted.

The following events summarize the ALERT output interrupt

operation in the SMBus alert mode:

Event A: Master senses the ALERT line being LOW.

Event F: Master resets the ALERT mask bit 7 in the Configuration

register.

Event A to B: Master sends a read command using the common

7-bit Alert Response Address (ARA) of 0001 100.

ALERT output in SMBus alert mode

Event A to B: Alerting device(s) return ACK signal and their

addresses using the I C Arbitration (the device with the lowest

address value sends its address first. The master can repeat the

alert reading process and work up through all the interrupts).

When several slave devices share a common interrupt line, an

SMBus alert line is implemented. The SA56004X is designed to

accommodate the Alert interrupt detection capability of the SMBus

2.0 Alert Response Address (ARA) protocol, defined in SMBus

specification 2.0. This procedure is designed to assist the master in

resolving which slave device generated the interrupt and in servicing

the interrupt while minimizing the time to restore the system to its

proper operation. Basically, the SMBus provides Alert response

interrupt pointers in order to identify slave devices which have

caused the Alert interrupt. When the ARA command is received by

all devices on the SMBus, the devices pulling the SMBus alert line

LOW send their device addresses to the master; await an

acknowledgement and then release the alert line. This requirement

to disengage the SMBus alert line prevents locking up the alert line.

The SA56004X complies with this ARA disengagement protocol by

setting the ALERT mask bit 7 in the Configuration register at address

09h after successfully sending out its address in response to an

ARA command and releasing the ALERT output. Once the mask bit

is activated, the ALERT output will be disabled until enabled by

software. In order to enable the ALERT the master must read the

Status register, at address 02h, during the interrupt service routine

and then reset the ALERT mask bit 7 in the Configuration register to

‘0’ at the end of the interrupt service routine (See Figure 14).

2

Event B: Upon the successful completion of returning address, the

SA56004X resets its ALERT output (to OFF) and sets the Alert

Mask bit 7 in its configuration register.

Event C: Master should read the device status register to identify

and correct the conditions that caused the Alert interruption. The

status register is reset.

Event D: Master resets the Alert Mask bit 7 in the configuration

register to enable the device Alert output interruption.

Note: The bit assignment of the returned data from the ARA

reading is listed in Table 14. If none of the device on the bus is

alerted then the returned data from ARA reading will be FFh

(1111 1111).

Table 14. ALERT response bit assignment

Alert

response

bit

Device

address

bit

Function

7 (MSB)

ADD6

ADD5

ADD4

ADD3

ADD2

ADD1

ADD0

1

Address bit 6 (MSB) of alerted device

Address bit 5 of alerted device

Address bit 4 of alerted device

Address bit 3 of alerted device

Address bit 2 of alerted device

Address bit 1 of alerted device

Address bit 0 of alerted device

Always ‘1’

In order for the SA56004X to respond to the ARA command, the bit

D0 in the ALERT mode register must be set LOW.

6

5

4

3

2

1

0

ALERT mask bit 7 and the ALERT mode bit D0 are both LOW for

the POR default.

Remote Temp

High Limit

Remote

Diode Temp

SA56004–X

ALERT pin

Status Register

Bit 4(RHIGH)

D

A

B

C

SL02057

Figure 14. ALERT pin in SMBus Alert mode

15

2004 Oct 06

Philips Semiconductors

Product data sheet

±1 °C accurate, SMBus-compatible, 8-pin, remote/local

digital temperature sensor with over temperature alarms

SA56004X

T_CRIT output

The T_CRIT output is LOW when any temperature reading is

greater than the preset limit in the corresponding critical temperature

Remote

Temperature

setpoint register. When one of the T_CRIT setpoint temperatures is

RCS

exceeded, the appropriate status register bit, 1 (RCRIT) or 0

RCS -TH

(LCRIT), is set.

Remote HIGH

After every local and remote temperature conversion the Status

register flags and the T_CRIT output are updated. Figure 15 is a

Setpoint

timing diagram showing the relationship of T_CRIT output, Status

bit 1 (RCRIT) and the remote critical temperature setpoint (RCS),

and critical temperature hysteresis (TH) with remote temperature

Remote LOW

Setpoint

changes. Note that the T_CRIT output is de-activated only after the

remote temperature is below the remote temperature setpoint, RCS

minus the Hysteresis, TH. In the interrupt mode only, the Status

register flags are reset after the Status register is read.

ALERT Output

RCS

T_CRIT Output

Events

Remote Temperature

RCS - TH

A

B

C

D

E

F

G

H

I

SL02059

NOTE: All events indicate the completion of a conversion.

Status Bit 1, RCRIT

T_CRIT Output

Figure 16. Fault Queue Remote High and Low and T_CRIT,

T_CRIT Hysteresis setpoint response (Comparator mode)

At Event A: The remote temperature has exceeded the Remote

HIGH setpoint.

At Event B: Three consecutive over limit measurements have been

made exceeding the Remote HIGH setpoint; the ALERT output is

activated (goes LOW).

A

B

C

SL02058

Figure 15. T_CRIT temperature response timing diagram

By now, the remote temp has exceeded the Remote T_CRIT

setpoint (RCS).

Event A: T_CRIT goes LOW and Status bit 1, RCRIT is set HIGH

when Remote Temperature exceeds RCS, Remote T_CRIT

Setpoint.

At Event C: Three consecutive over limit measurements have been

made exceeding RCS; the T_CRIT output is activated (goes LOW).

Event B: Remote Temperature goes below RCS-TH. T_CRIT is

deactivated, but Status Register remains unchanged.

At Event D: The remote temperature falls below the RCS–TH

setpoint.

Event C: The Status Register Bit 1, RCRIT is reset by a read of the

Status Register (in the interrupt mode).

At Event E: The ALERT output is de-activated (goes HIGH) after a

below_high_limit temperature measurement is completed.

Fault Queue

At Event F: Three consecutive measurements have been made

with the remote temperature below the RCS–TH threshold; the

T_CRIT output is de-activated (goes HIGH).

To suppress erroneous ALERT or T_CRIT triggering, the SA56004X

implements a Fault Queue for both local and remote channel. The

Fault Queue insures a temperature measurement is genuinely

beyond a HIGH, LOW or T_CRIT setpoint by not triggering until

three consecutive out-of-limit measurements have been made. The

fault queue defaults off upon POR and may be activated by setting

bit 0 in the Configuration register (address 09h) to ‘1’.

At Event G: The remote temp falls below the Remote LOW setpoint.

At Event H: Three consecutive measurements are made with the

temp below the Remote LOW setpoint; ALERT output is activated

(goes LOW).

At Event I: The ALERT output is de-activated (goes HIGH) after a

above_low_limit temperature measurement is completed.

16

2004 Oct 06

Philips Semiconductors

Product data sheet

±1 °C accurate, SMBus-compatible, 8-pin, remote/local

digital temperature sensor with over temperature alarms

SA56004X

Remote diode selection

SMBus INTERFACE

To measure the remote temperature or the temperature of an

externally attached diode, the device automatically forces two

successive currents of about 160 µA and 10 µA at D+ pin. It

measures the voltage (VBE) between D+ and D–, detects the

difference between the two VBEs or the ∆VBE and then converts the

∆VBE into a temperature data using the basic PTAT voltage formula

as shown below. The device typically takes about 38 ms to perform

a measurement during each conversion period or cycle, which is

selectable by programming the conversion rate register.

The device can communicate over a standard two-wire serial

2

interface System Management Bus (SMBus) or compatible I C-bus

using SCLK and SDATA. The device employs four standard SMBus

protocols: Write Byte, Read Byte, Receive Byte, and Send Byte.

Data formats of four protocols are shown in Figure 17. The following

key points of protocol are important:

1. The SMBus master initiates data transfer by establishing a

START condition (S) and terminates data transfer by generating

a STOP condition (P).

kT

q

I2

I1

2. Data is sent over the serial bus in sequences of 9 clock pulses

according to each 8-bit data byte followed by 1-bit status of

device acknowledgement (A).

_lnǒ Ǔ

DVBE + n

where:

n: Diode ideality factor

k: Boltzmann’s constant

T: Absolute temperature (° K) = 273 °C + T (°C)

q: Electron charge

ln: Natural logarithm

3. The 7-bit slave address is equivalent to factory-programmed

address of the device.

4. The command byte is equivalent to the address of the selected

device register.

I2, I1: Two source currents

5. The receive byte format is used for quicker transfer data from a

device reading register which was previously selected.

Because the device does not directly convert the sensed VBE as in

the old method of temperature measurement systems, the VBE

calibration is not required. Furthermore, the device remote

temperature error is adjusted at the manufacturer to meet the

specifications with the use of the reference diode-connected

transistors such as the 2N3904/2N3906. The diode type to be used

in customer applications must have the characteristics as close to

the 2N3904/2N3906 as possible in order to obtain optimal results.

Finally, to prevent the effects of system noise on the measured VBE

signals, an external capacitor of about 2200 pF connected between

the D+ and D– pins as well as the grounded-shield cable for the

diode connection wires are recommended.

Serial interface reset

If the SMBus master attempts to reset the SA56004X while the

SA56004X is controlling the data line and transmitting on the data

line, the SA56004X must be returned to a known state in the

communication protocol. This may be accomplished in two ways:

1. When the SDATA is LOW, the SA56004X SMBus state machine

resets to the SMBus idle state if SCLK is held LOW for more

than 35 ms (maximum TIMEOUT period). According to SMBus

specification 2.0, all devices are required to time-out when the

SCLK line is held LOW for 25 to 35 ms. Therefore, to insure a

time-out of all devices on the bus, the SCLK line must be held

LOW for at least 35 ms.

Diode fault detection

The SA56004X is designed with circuitry to detect the fault

conditions of the remote diode. When the D+ pin is shorted to V

DD

2. When the SDATA is HIGH, the master initiates an SMBus start.

The SA56004X will respond properly to a SMBus start condition

only during the data retrieving cycle. After the start, the

SA56004X will expect a SMBus Address byte.

or floating, the Remote Temperature High Byte (RTHB) register is

loaded with +127 °C, the Remote Temperature Low Byte (RTLB)

register is loaded with 0 °C, and the OPEN bit (bit 2 of the Status

register) is set. Under the above conditions of D+ shorted to V or

DD

floating, if the Remote T_CRIT setpoint is set less than +127 °C, and

T_CRIT Mask are disabled, then, the T_CRIT output pins will be

pulled LOW. Furthermore, if the Remote HIGH Setpoint High Byte

(RHSHB) register is set to a value less than +127 °C and the Alert

Mask is disabled, then the ALERT output will be pulled LOW.

Note: the OPEN bit itself will not trigger an ALERT.

When the D+ pin is shorted to ground or to D–, the Remote

Temperature High Byte (RTHB) register is loaded with –128 °C

(1000 0000) and the OPEN (bit 2 in the Status register) will not be

set. Since operating the SA56004X is beyond its normal limits, this

temperature reading represents this shorted fault condition. If the

value in the Remote Low Setpoint High Byte (RLSHB) register is

more than –128 °C and the Alert Mask is disabled, the ALERT

output will be pulled LOW.

17

2004 Oct 06

Philips Semiconductors

Product data sheet

±1 °C accurate, SMBus-compatible, 8-pin, remote/local

digital temperature sensor with over temperature alarms

SA56004X

WRITE BYTE FORMAT (To write a data byte to the device register) :

1

2

3

4

5

6

7

8

9

1

2

3

4

5

6

7

8

9

(TO NEXT)

SCLK

SDATA

a6

a5

a4

a3

a2

a1

a0

D7

D6

D5

D4

D3

D2

D1

D0

S

W

A

9

A

DEVICE ADDRESS

DEVICE REGISTER COMMAND

1

2

3

4

5

6

7

8

SCLK

(CONT)

SDATA

D7

D6

D5

D4

D3

D2

D1

D0

A

P

DATA TO BE WRITTEN TO RGTR

READ BYTE FORMAT (To read a data byte from the device register) :

1

2

3

4

5

6

7

8

9

1

2

3

4

5

6

7

8

9

(TO NEXT)

SCLK

(TO NEXT)

P

SDATA

a6

a5

a4

a3

a2

a1

a0

D7

D6

D5

D4

D3

D2

D1

D0

S

W

8

A

9

A

DEVICE ADDRESS

DEVICE REGISTER COMMAND

STOP

1

2

3

4

5

6

7

1

2

3

4

5

6

7

8

9

SCLK (CONT)

SDATA (CONT)

a6

a5

a4

a3

a2

a1

a0

D7

D6

D5

D4

D3

D2

D1

D0

S

R

A

NA

P

RESTART

DEVICE ADDRESS

DATA FROM DEVICE REGISTER

STOP

RECEIVE BYTE FORMAT (To read a data byte from already pointed register) :

1

2

3

4

5

6

7

8

9

1

2

3

4

5

6

7

8

9

SCLK (CONT)

SDATA (CONT)

a6

a5

a4

a3

a2

a1

a0

D7

D6

D5

D4

D3

D2

D1

D0

S

R

A

NA

P

RESTART

DEVICE ADDRESS

DATA FROM DEVICE REGISTER

SEND BYTE FORMAT:

1

2

3

4

5

6

7

8

9

1

2

3

4

5

6

7

8

9

SCLK

SDATA

a6

a5

a4

a3

a2

a1

a0

D7

D6

D5

D4

D3

D2

D1

D0

S

W

A

P

DEVICE ADDRESS

DEVICE REGISTER COMMAND

STOP

SL02016

Figure 17. SMBus interface protocols.

18

2004 Oct 06

Philips Semiconductors

Product data sheet

±1 °C accurate, SMBus-compatible, 8-pin, remote/local

digital temperature sensor with over temperature alarms

SA56004X

6. A shielded twisted pair is recommended if remote sensor is

Printed Circuit Board layout considerations

Care must be taken in PCB layout to minimize noise induced at the

remote temperature sensor inputs, especially in extremely noisy

environments, such as a computer motherboard. Noise induced in

the traces running between the device sensor inputs and the remote

diode can cause temperature conversion errors. Typical sensor

signal levels to the SA56004X is a few microvolts. The following

guidelines are recommended:

located several feet away from the temperature sensor. Under

this circumstance, connect the shield of the cable at the device

side to the SA56004X GND pin and leave the shield at the

remote end unconnected to avoid ground loop currents. Also

notice that the series resistance of the cable may introduce

measurement error; 1 Ω can introduce about 0.5 °C.

1. Place the SA56004X as close as possible to the remote sensor.

It can be from 4 to 8 inches, as long as the worst noise sources

such as clock generator, data and address buses, CRTs are

avoided.

GND

D+

2. Route the D+ and D– lines parallel and close together with

ground guards enclosing them (see ‘Ideal diode trace layout’,

Figure 18).

3. Leakage currents due to PC board contamination must be

considered. Error can be introduced by these leakage currents.

D–

4. Use wide traces to reduce inductance and noise pickup. Narrow

traces more readily pickup noise. The minimum width of 10 mil

and space of 10 mil are recommended.

GND

5. Place a bypass capacitor of 10 nF close to the V pin and an

DD

SL02017

input filter capacitor of 2200 pF close to the D+ and D– pins.

Figure 18. D+ and D– trace layout.

PACKING METHOD

The SA56004X is packed in reels, as shown in Figure 19.

GUARD

BAND

TAPE

TAPE DETAIL

REEL

ASSEMBLY

COVER TAPE

CARRIER TAPE

BARCODE

LABEL

BOX

SL01305

Figure 19. Tape and reel packing method

19

2004 Oct 06

Philips Semiconductors

Product data sheet

±1 °C accurate, SMBus-compatible, 8-pin, remote/local

digital temperature sensor with over temperature alarms

SA56004X

SO8: plastic small outline package; 8 leads; body width 3.9 mm

SOT96-1

20

2004 Oct 06

Philips Semiconductors

Product data sheet

±1 °C accurate, SMBus-compatible, 8-pin, remote/local

digital temperature sensor with over temperature alarms

SA56004X

TSSOP8: plastic thin shrink small outline package; 8 leads; body width 3 mm

SOT505-1

21

2004 Oct 06

Philips Semiconductors

Product data sheet

±1 °C accurate, SMBus-compatible, 8-pin, remote/local

digital temperature sensor with over temperature alarms

SA56004X

REVISION HISTORY

Rev

Date

Description

_3

20041006

Product data sheet (9397 750 13841). Supersedes Objective data of 2003 Sep 03 (9397 750 12015).

Modifications:

• Change data sheet status from “Objective data” to “Product data”

• “Features” section:

th

– 4 bullet: change marking code from “ARW” to “56004E/600E”

th

– add (new) 8 bullet

th

– add (new) 13 bullet

• Figure 1, “Simplified system diagram” modified.

• Table 1: add Marking codes

• “Maximum ratings” table: add V

ratings, and Note 1.

esd

• “Electrical characteristics” table:

– change description line below title from “T

= 25 °C, ...” to “T

= 0 °C to +125 °C, ...”

amb

– Symbol I , Quiescent current: change Condition from “26 Hz conversion rate” to “16 Hz conversion rate”

DD

• Change section “Technical description”, “General discussion” to “Block diagram”

• Figure 4 modified.

• Table 5: change title from “Configuration Register (CR) bit assignments” to “Configuration register (CON) bit

assignments”

• Section “Customer programmable offset register (remote only)” renamed to “Programmable offset register (remote

only)”

• Add section “Remote diode selection”

• Section “Printed Circuit Board layout considerations”: List item #6 re-written.

_2

_1

20030903

20030819

Objective data (9397 750 12015). Replaces SA56004-X_1 dated 2003 Aug 19 (9397 750 10993).

Objective data (9397 750 10993).

22

2004 Oct 06

Philips Semiconductors

Product data sheet

±1 °C accurate, SMBus-compatible, 8-pin, remote/local

digital temperature sensor with over temperature alarms

SA56004X

2

Purchase of Philips I C components conveys a license under the Philips’ I C patent

2

to use the components in the I C system provided the system conforms to the

I C specifications defined by Philips. This specification can be ordered using the

2

code 9398 393 40011.

Data sheet status

Product

status

Definitions

[1]

Level

Data sheet status

[2] [3]

I

Objective data

Development

This data sheet contains data from the objective specification for product development.

Philips Semiconductors reserves the right to change the specification in any manner without notice.

II

Preliminary data

Qualification

Production

This data sheet contains data from the preliminary specification. Supplementary data will be published

at a later date. Philips Semiconductors reserves the right to change the specification without notice, in

order to improve the design and supply the best possible product.

III

Product data

This data sheet contains data from the product specification. Philips Semiconductors reserves the

right to make changes at any time in order to improve the design, manufacturing and supply. Relevant

changes will be communicated via a Customer Product/Process Change Notification (CPCN).

[1] Please consult the most recently issued data sheet before initiating or completing a design.

[2] The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at URL

http://www.semiconductors.philips.com.

[3] For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status.

Definitions

Short-form specification — The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see

the relevant data sheet or data handbook.

Limitingvaluesdefinition— Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 60134). Stress above one or more of the limiting

values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given

in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability.

Application information — Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no

representation or warranty that such applications will be suitable for the specified use without further testing or modification.

Disclaimers

Life support — These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be

expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree

to fully indemnify Philips Semiconductors for any damages resulting from such application.

Right to make changes — Philips Semiconductors reserves the right to make changes in the products—including circuits, standard cells, and/or software—described

or contained herein in order to improve design and/or performance. When the product is in full production (status ‘Production’), relevant changes will be communicated

viaaCustomerProduct/ProcessChangeNotification(CPCN).PhilipsSemiconductorsassumesnoresponsibilityorliabilityfortheuseofanyoftheseproducts,conveys

nolicenseortitleunderanypatent, copyright, ormaskworkrighttotheseproducts, andmakesnorepresentationsorwarrantiesthattheseproductsarefreefrompatent,

copyright, or mask work right infringement, unless otherwise specified.

Koninklijke Philips Electronics N.V. 2004

Contact information

For additional information please visit

http://www.semiconductors.philips.com.

Fax: +31 40 27 24825

Date of release: 10-04

9397 750 13841

For sales offices addresses send e-mail to:

sales.addresses@www.semiconductors.philips.com.

Document order number:

Philips

Semiconductors

23

2004 Oct 06


型号：	SA56004ADP
厂家：	NXP
描述：	1 Degrees Celcious accurate, SMBus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms 1度Celcious准确的， SMBus兼容， 8针，远程/本地数字温度传感器，具有超温报警模拟IC 传感器温度传感器信号电路光电二极管
文件：	总23页 (文件大小：215K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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