SE95D [NXP]
Ultra high accuracy digital temperature sensor and thermal WatchdogE; 超高精度数字温度传感器和热WatchdogE
| 型号： | SE95D |
| 厂家： | 
NXP |
| 描述： | Ultra high accuracy digital temperature sensor and thermal WatchdogE |
| 文件： | 总20页 (文件大小：202K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
INTEGRATED CIRCUITS
SE95
Ultra high accuracy digital temperature
sensor and thermal Watchdog
Product data sheet
2004 Dec 21
Supersedes data of 2004 Oct 05
Philips
Semiconductors
Philips Semiconductors
Product data sheet
Ultra high accuracy digital temperature sensor and
thermal Watchdog
SE95
The device is powered-up in normal operation mode with the OS in
comparator mode, temperature threshold of 80 °C and hysteresis of
75 °C, so that it can be used as a stand-alone thermostat with those
pre-defined temperature set points. The conversion rate is
programmable, with a default of 10 conversions/sec.
FEATURES
• Pin-for-pin replacement for industry standard LM75/LM75A and
offers improved temperature resolution
• Specification of a single part over power supply range from 2.8 V
GENERAL DESCRIPTION
to 5.5 V.
The SE95 is a temperature-to-digital converter using an on-chip
band-gap temperature sensor and Sigma-delta A-to-D conversion
technique. The device is also a thermal detector providing an
over-temp detection output. The SE95 contains a number of data
registers: Configuration register (Conf) to store the device settings
such as sampling rate, device operation mode, OS operation mode,
OS polarity, and OS fault queue as described in the functional
description section; temperature register (Temp) to store the digital
temp reading, and set-point registers (Tos & Thyst) to store
programmable overtemp shutdown and hysteresis limits, and also
an ID register to store manufacturer numbers. These registers are
• Small 8-pin package types: SO8 and TSSOP8 (MSOP8)
2
• I C-bus interface to 400kHz with up to 8 devices on the same bus
• Power supply range from 2.8 V to 5.5 V
• Temperatures range from –55 °C to +125 °C
• 13-bit ADC that offers a temperature resolution of 0.03125 °C
• Temperature accuracy of ±1 °C from –25 °C to +100 °C
• Programmable temperature threshold and hysteresis set points
2
accessed by a controller via the 2-wire serial I C-bus interface. The
device includes an open-drain output (OS) which becomes active
when the temperature exceeds the programmed limits. There are
three selectable logic address pins so that eight devices can be
connected on the same bus without address conflict.
• Supply current of 7.0 µA in shut-down mode for power
conservation
• Stand-alone operation as thermostat at power-up
• ESD protection exceeds 1000 V HBM per JESD22-A114,
The SE95 can be configured for different operation conditions. It can
be set in normal mode to periodically monitor the ambient
temperature, or in shutdown mode to minimize power consumption.
The OS output operates in either of two selectable modes: OS
comparator mode and OS interrupt mode. Its active state can be
selected as either HIGH or LOW. The fault queue that defines the
number of consecutive faults in order to activate the OS output is
programmable as well as the set-point limits.
150 V MM per JESD22-A115
• Latch-up testing is done to JEDEC Standard JESD78 which
exceeds 100 mA
APPLICATIONS
• System thermal management
The temperature register always stores a 13-bit 2’s complement
data giving a temperature resolution of 0.03125 °C. This high
temperature resolution is particularly useful in applications of
measuring precisely the thermal drift or runaway. For normal
operation and compatibility with the LM75A, only the 11 MSBs are
read, with a resolution of 0.125 °C to provide the accuracies
specified. To be compatible with the LM75, read only the 9 MSBs.
• Personal computers
• Electronics equipment
• Industrial controllers
ORDERING INFORMATION
Package
Temperature
range
Type number Topside mark
Name
Description
Version
SE95D
SE95
SO8
plastic small outline package; 8 leads; body width 3.9 mm
SOT96-1
–55 °C to +125 °C
–55 °C to +125 °C
plastic thin shrink small outline package; 8 leads;
body width 3 mm
SE95DP
SE95DP
TSSOP8
SOT505-1
WATCHDOG is a trademark of National Semiconductor Corporation.
2004 Dec 21
2
Philips Semiconductors
Product data sheet
Ultra high accuracy digital temperature sensor and
thermal Watchdog
SE95
PINNING
Pin configuration
Pin description
PIN
SYMBOL DESCRIPTION
2
1
SDA
Digital I/O. I C serial bi-directional data line.
Open Drain.
SDA
SCL
OS
1
2
3
4
8
7
6
5
V
CC
A0
A1
A2
2
2
3
4
SCL
OS
Digital input. I C serial clock input.
Overtemp Shutdown output. Open Drain.
GND
GND
Ground. To be connected to the system
ground.
SL01388
5
6
7
8
A2
A1
A0
Digital input. User-defined address bit2.
Digital input. User-defined address bit1.
Digital input. User-defined address bit0.
Power supply.
Figure 1. SO8 and TSSOP8 pin configurations.
V
CC
SIMPLIFIED BLOCK DIAGRAM
V
CC
SE95
A/D CONTROL AND OTP CONTROL
OTP
CONF REG
TEMP REG
TOS REG
BIAS
BANDGAP
OSC
BIT
STREAM
SIGMA–DELTA
MODULATOR
DECIMATION
FILTER
INTERRUPTION
LOGIC
T
REG
HYST
.
.
.
REGISTER
BANK
POR
OS
2
I C INTERFACE LOGIC
A2
A1
A0
SCL
SDA
GND
SL01735
Figure 2. Simplified block diagram.
3
2004 Dec 21
Philips Semiconductors
Product data sheet
Ultra high accuracy digital temperature sensor and
thermal Watchdog
SE95
TYPICAL APPLICATION CIRCUIT
V
POWER SUPPLY
CC
0.1 µF
10 kΩ
BUS
PULL-UP
RESISTORS
8
V
CC
2
1
SCL
SDA
2
I C-BUS
SE95
3
DETECTOR OR
INTERRUPT LINE
OS
5
6
7
A2
A1
A0
DIGITAL LOGIC OR
TIE TO V /GND
CC
GND
4
SL01883
Figure 3. Typical application circuit
1
ABSOLUTE MAXIMUM RATINGS
SYMBOL
PARAMETER
MIN.
–0.3
–0.3
–3.0
–5.0
–
MAX.
6.0
UNIT
V
V
to GND
CC
Voltage at inputs SCL and SDA
Voltage at inputs A0, A1, A2
Current at input pins
6.0
V
V
+ 0.3
V
CC
5.0
mA
mA
V
OS output sink current
OS output voltage
10.0
6.0
–0.3
–
V
esd
Human Body Model
1000
150
150
150
V
Machine Model
–
V
T
stg
Storage temperature range
Junction temperature
–65
–
°C
°C
T
j
NOTE:
1. This is a stress rating only. Functional operation of the device as indicated in the operational section is not applied to this absolute maximum
rating. Stresses above those listed in ‘Absolute Maximum Ratings’ may cause permanent damage to the device and exposure to any of
these rating conditions for extended periods may affect device reliability.
OPERATING RATINGS
SYMBOL
PARAMETER
MIN.
2.8
MAX.
5.5
UNIT
V
V
CC
Supply voltage
T
amb
Operating ambient temperature range
–55
125
°C
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2004 Dec 21
Philips Semiconductors
Product data sheet
Ultra high accuracy digital temperature sensor and
thermal Watchdog
SE95
DC ELECTRICAL CHARACTERISTICS
V
CC
= 2.8 V to 5.5 V, T
= –55 °C to +125 °C unless otherwise noted.
amb
2
SYM
PARAMETER
Temperature accuracy (Note 1)
= 2.8 V to 3.6 V
CONDITIONS
MIN.
–1.0
–2.0
–2
–3
–
TYP.
MAX.
+1.0
+2.0
+2
+3
–
UNIT
°C
T
ACC
T
= –25 °C to +100 °C
= –55 °C to +125 °C
= –25 °C to +100 °C
= –55 °C to +125 °C
–
–
–
–
amb
V
CC
T
amb
°C
Temperature accuracy (Note 1)
= 3.6 V to 5.5 V
T
amb
°C
V
CC
T
amb
°C
T
RES
Temperature resolution
11-bit digital temp data
Normal mode
0.125
33
150
–
°C
T
CON
Temperature conversion time
Supply quiescent current
–
–
ms
µA
mA
µA
2
I
Normal mode: I C inactive
–
–
DD
2
Normal mode: I C active
–
1.0
–
Shut-down mode
Digital pins (SCL, SDA, A2–A0)
Digital pins
–
7.5
–
V
IH
HIGH-level input voltage
LOW-level input voltage
Input voltage hysteresis
0.7 × V
V
+ 0.3
V
V
CC
CC
V
IL
–0.3
–
–
0.3 × V
–
CC
V
IHYS
SCL and SDA pins
A2 to A0 pins
300
300
–
mV
mV
µA
µA
V
–
–
I
IH
HIGH–level input current
LOW-level input current
LOW-level output voltage
Digital pins; V = V
CC
–1.0
–1.0
–
1.0
1.0
0.4
0.8
10
IN
I
IL
Digital pins; V = 0 V
–
IN
V
OL
SDA and OS pins; I = 3 mA
–
OL
I
OL
= 4 mA
–
–
V
I
LO
Output leakage current
Power-on reset
SDA and OS pins; V = V
CC
–
–
µA
V
OH
POR
V
supply below which the logic
1.0
–
2.5
CC
is reset
3
OSQ
Tos
OS fault queue
Overtemp shutdown
Sampling rate
Programmable
Default value
Programmable
Default value
Digital pins
1
–
–
6
–
Conv
80
10
75
20
°C
0.125
30
–
sample/s
°C
Thyst
Hysteresis
–
–
C
Input capacitance
–
pF
IN
NOTE:
1. Assumes a minimum 11-bit temperature reading.
2. Typical values are at V = 3.3 V and T
= 25 °C.
CC
amb
3. Conv: device A-to-D conversion.
5
2004 Dec 21
Philips Semiconductors
Product data sheet
Ultra high accuracy digital temperature sensor and
thermal Watchdog
SE95
2
1
I C INTERFACE AC CHARACTERISTICS
V
CC
= 2.8 V to 5.5 V, T
= –55 °C to +125 °C unless otherwise noted.
amb
SYMBOL
PARAMETER
CONDITIONS
See timing diagram (Figure 4)
MIN.
2.5
0.6
1.3
100
100
0
TYP.
MAX.
UNIT
µs
t
SCL clock period
–
–
–
–
–
–
–
–
–
–
CLK
t
SCL HIGH pulse width
SCL LOW pulse width
Start Hold time
µs
HIGH
t
–
µs
LOW
t
t
–
ns
HD:STA
SU:DAT
HD;DAT
SU;STO
Data set–up time
–
ns
t
Data hold time
–
ns
t
Stop set-up time
100
–
–
ns
t
F
Fall time (SDA and OS outputs)
C = 400 pF; I = 3 mA
250
ns
L
OL
NOTE:
1. These specifications are guaranteed by design and not tested in production.
SDA
t
t
f
t
t
t
HD;STA
SU;DAT
LOW
f
SCL
t
t
HD;STA
SU;STO
t
t
HIGH
HD;DAT
P
S
S
Sr
SL02097
Figure 4. Timing diagram.
6
2004 Dec 21
Philips Semiconductors
Product data sheet
Ultra high accuracy digital temperature sensor and
thermal Watchdog
SE95
PERFORMANCE CURVES
25
20
15
0.25
0.20
V
= 2.8 V
CC
V
= 5.5 V
CC
V
= 3.3 V
CC
0.15
0.10
V
= 5.5 V
CC
V
= 3.9 V
CC
10
5
V
= 3.9 V
CC
V
= 3.3 V
CC
V
= 2.8 V
CC
0.05
0.00
0
–50
–25
0
25
50
75
100
125
SL02150
–50
–25
0
25
50
75
100
125
SL02153
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 5. Typical shut-down supply current versus
Figure 8. Typical SDA V versus temperature and V
OL CC
temperature and V
(I = 3 mA)
OL
CC
300
35
34
V
= 5.5 V
CC
250
200
V
= 3.9 V
33
32
CC
150
100
V
= 2.8 V
CC
V
= 3.3 V
CC
31
30
50
0
–50
–25
0
25
50
75
100
125
SL02152
–50
–25
0
25
50
75
100
125
SL02154
TEMPERATURE (°C)
TEMPERATURE (°C)
2
Figure 6. Typical normal I C inactive supply current versus
Figure 9. Typical conversion time versus temperature
(V = 2.8 V to 5.5 V)
temperature and V
CC
CC
300
0.25
0.20
V
= 2.8 V
CC
250
200
30 Conv./second
V
= 3.3 V
CC
0.15
0.10
10 Conv./second
1 Conv./second
150
100
V
= 3.9 V
CC
V
= 5.5 V
CC
0.125 Conv./second
0.05
0.00
50
0
–50
–25
0
25
50
75
100
125
SL02151
–50
–25
0
25
50
75
100
125
SL02155
TEMPERATURE (°C)
TEMPERATURE (°C)
2
Figure 7. Typical normal I C inactive supply current versus
Figure 10. Typical OS V versus temperature and V
OL CC
temperature and conversion rate (V = 3.3 V)
(I = 3 mA)
OL
CC
7
2004 Dec 21
Philips Semiconductors
Product data sheet
Ultra high accuracy digital temperature sensor and
thermal Watchdog
SE95
The way that the OS output responds to the comparison operation
depends upon the OS operation mode selected by configuration
bit B1, and the user-defined fault queue defined by configuration
bits B3 and B4.
FUNCTIONAL DESCRIPTION
General operation
The SE95 uses the on-chip band-gap sensor to measure the device
temperature with the resolution of 0.03125 °C and stores the 13-bit
2’s complement digital data, resulted from 13-bit A-to-D conversion,
into the device Temp register. This Temp register can be read at any
In OS comparator mode, the OS output behaves like a thermostat. It
becomes active when the Temp exceeds the Tos, and is reset when
the Temp drops below the Thyst. Reading the device registers or
putting the device into shut-down does not change the state of the
OS output. The OS output in this case can be used to control
cooling fans or thermal switches.
2
time by a controller on the I C-bus. Reading temperature data does
not affect the conversion in progress during the read operation.
The device can be set to operate in either mode: normal or
shut-down. In normal operation mode, by default, the temp-to-digital
conversion is executed every 100 ms and the Temp register is
updated at the end of each conversion. In shut-down mode, the
device becomes idle, data conversion is disabled and the Temp
In OS interrupt mode, the OS output is used for thermal interruption.
When the device is powered-up, the OS output is first activated only
when the Temp exceeds the Tos; then it remains active indefinitely
until being reset by a read of any register. Once the OS output has
been activated by crossing Tos and then reset, it can be activated
again only when the Temp drops below the Thyst; then again, it
remains active indefinitely until being reset by a read of any register.
The OS interrupt operation would be continued in this sequence:
Tos trip, Reset, Thyst trip, Reset, Tos trip, Reset, Thyst trip, Reset,
and etc. Putting the device into shut-down mode also resets the OS
output.
2
register holds the latest result; however, the device I C interface is
still active and register write/ read operation can be performed. The
device operation mode is controlled by programming bit B0 of the
configuration register. The temperature conversion is initiated when
the device is powered up or returned to normal mode from
shut-down.
In addition, at the end of each conversion in normal mode, the
temperature data (or Temp) in the Temp register is automatically
compared with the over-temp shut-down threshold data (or Tos)
stored in the Tos register, and the hysteresis data (or Thyst) stored
in the Thyst register, in order to set the state of the device OS output
accordingly. The device Tos and Thyst registers are write/read
capable, and both operate with 9-bit 2’s complement digital data.
To match with this 9-bit operation, the temp register uses only the
9 MSB bits of its 13-bit data for the comparison.
In both cases, comparator mode and interrupt mode, the OS output
is activated only if a number of consecutive faults, defined by the
device fault queue, has been met. The fault queue is programmable
and stored in the two bits, B3 and B4, of the Configuration register.
Also, the OS output active state is selectable as HIGH or LOW by
setting accordingly the configuration register bit B2.
At power-up, the device is put into normal operation mode, the Tos
is set to 80 °C, the Thyst is set to 75 °C, the OS active state is
selected LOW and the fault queue is equal to 1. The temp reading
data is not available until the first conversion is completed in about
33 ms.
The device temperature conversion rate is programmable and can
be chosen to be one of the four values: 0.125, 1.0, 10, and 30
conversions per second. The default conversion rate is 10
conversions per second. Furthermore, the conversion rate is
selected by programming bits B5 and B6 of the Configuration
Register as shown in Table 3. Note that the average supply current
as well as the device power consumption increase with the
conversion rate.
The OS response to the temperature is illustrated in Figure 11.
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2004 Dec 21
Philips Semiconductors
Product data sheet
Ultra high accuracy digital temperature sensor and
thermal Watchdog
SE95
Tos
Temp
Thyst
READING TEMPERATURE & LIMITS
OS RESET
OS ACTIVE
OS OUTPUT IN COMPARATOR MODE
OS RESET
*
*
*
OS ACTIVE
TIME
OS OUTPUT IN INTERRUPT MODE
POWER-UP
*
= OS is reset by either reading register or putting the device in shutdown.
Assumed that the fault queue is met at each Tos and Thyst crossing point.
SL01392
Figure 11. OS response to temperature.
9
2004 Dec 21
Philips Semiconductors
Product data sheet
Ultra high accuracy digital temperature sensor and
thermal Watchdog
SE95
2
I C serial interface
Register list
The SE95 can be connected to a compatible 2-wire serial interface
The SE95 contains 7 data registers. The registers can be 1 byte or
2 bytes wide, and are defined in Table 2. The registers are accessed
2
I C-bus as a slave device under the control of a controller or master
2
device, using two device terminals, SCL and SDA. The controller
must provide the SCL clock signal and write/read data to/from the
device through the SDA terminal. Note that if the I C common
by the value in the content of the pointer register during I C-bus
communication. The types of registers are: read only, read/write,
and reserved for manufacturer use. Note that when reading a
two-byte register, the host must provide enough clock pulses as
2
2
pull-up resistors have not been installed as required for I C-bus,
2
then an external pull-up resistor, about 10 kΩ, is needed for each of
these two terminals. The bus communication protocols are
described in the data communication section.
required by the I C protocol (see the “Data communication” section)
for the device to completely return both data bytes. Otherwise the
device may hold the SDA line as LOW state, resulting in a bus hang
condition.
Slave address
2
Register pointer
The SE95 slave address on the I C-bus is partially defined by the
logic applied to the device address pins A2, A1 and A0. Each pin is
typically connected either to GND for logic 0, or to V for logic 1.
The register pointer or pointer byte is an 8-bit data byte that is
2
equivalent to the register command in the I C-bus definitions and is
CC
These pins represent the three LSB bits of the device 7-bit address.
The other four MSB bits of the address data are preset to ‘1001’ by
hard wiring inside the SE95. Table 1 shows the device’s complete
address and indicates that up to 8 devices can be connected to the
same bus without address conflict. Because the input pins, SCL,
SDA, A2–A0, are not internally biased, it is important that they
should not be left floating in any application.
used to identify the device register to be accessed for a write or read
operation. Its values are listed as pointer values in Table 2, “Register
table”. For the device register I C-bus communication, the pointer
2
byte may or may not need to be included within the command as
2
illustrated in the I C protocol figures in section “Data
communication” on page 14.
The command statements of writing data to a register must always
include the pointer byte; while the command statements of reading
data from a register may or may not include it. To read a register that
is different from the one that has been recently read, the pointer byte
must be included. However, to re-read a register that has been
recently read, the pointer byte may not have to be included in the
reading.
Table 1. Address table
1 = HIGH, 0 = LOW
MSB
LSB
1
0
0
1
A2
A1
A0
At power-up, the pointer value is preset to ‘0’ for the Temp Register;
users can then read the temperature without specifying the pointer
byte.
Table 2. Register table
Register name Pointer value
R/W
R/W
POR state
Description
Conf
Temp
Tos
01H
00H
03H
00H
Configuration Register.
Contains a single 8-bit data byte. To set an operating condition.
Read only N/A
Temperature Register.
Contains two 8-bit data bytes. To store the measured Temp data.
R/W
R/W
50 00H
Over-temp Shutdown threshold Register.
Contains two 8-bit data bytes. To store the over-temp shut-down Tos limit.
Default = 80 °C.
Thyst
02H
4B 00H
Hysteresis Register.
Contains two 8-bit data bytes. To store the hysteresis Thyst limit.
B7–B0 are also used in OTP test mode to supply OTP write data.
Default = 75 °C.
ID
05H
Read only A1H
ID Register.
Contains a single 8-bit data byte for the manufacturer ID code.
reserved
reserved
04H
06H
N/A
N/A
N/A
N/A
Reserved.
Reserved.
10
2004 Dec 21
Philips Semiconductors
Product data sheet
Ultra high accuracy digital temperature sensor and
thermal Watchdog
SE95
Configuration register
The Configuration register is a write/read register and contains an 8-bit non-complement data byte that is used to configure the device for
different operating conditions. The Configuration register table (Table 3) shows the bit assignments of this register.
Table 3. Configuration register table
Bit
Name
R/W
R/W
R/W
POR
0
Description
B7
Reserved
Reserved for manufacturer’s use.
Sets the conversion rate:
B6–B5 Rate val
00
00 = 10 conversions/sec (default)
01 = 0.125 conversions/sec
10 = 1 conversions/sec
11 = 30 conversions/sec
B4–B3 OS Fault queue
R/W
R/W
0
0
0
0
For OS Fault Queue programming.
Programmable queue data = 0, 1 ,2, 3 for queue value = 1, 2, 4, 6 respectively. Default = 0.
B2
B1
B0
OS Polarity
For OS Polarity selection.
1 = OS active HIGH, 0 = OS active LOW (default).
OS Comp/Interrupt R/W
Shut-down R/W
For OS operation Mode selection.
1 = OS interrupt, 0 = OS comparator (default).
For Device Operation Mode selection.
1 = Shut-down, 0 = Normal (default).
Temperature Register (Temp)
The Temp register holds the digital result of temperature measurement or monitor at the end each A-to-D conversion. This register is read only
and contains two 8-bit data bytes consisting of one most significant (MS) data byte and one least significant (LS) data byte. However, only 13
bits of those two bytes are used to store the Temp data in 2’s complement format with the resolution of 0.03125 °C. The Temp register table
(Table 4) shows the bit arrangement of the Temp data in the data bytes.
Table 4. Temp Register table
Temp MS byte
Temp LS byte
MSB
LSB
MSB
LSB
B7
B6
D9
B5
D8
B4
B3
B2
D5
D7
B1
D4
D6
B0
B7
B6
D1
D3
B5
B4
B3
B2
X
B1
X
B0
for 11-bit Temp Data
Not used
MSB
LSB
D10
D7
D6
D3
D5
D2
D4
D0
X
X
X
X
for 13-bit Temp Data
Not used
LSB
D0
MSB
D12
D11
D10
D9
D8
D2
D1
X
X
When reading the Temp register, all 16 bits of the two data bytes (MS byte and LS byte) must be collected and then the 2’s complement data
value according to the desired resolution must be selected for the temperature calculation. The Table 4 has shown the examples for two cases:
11-bit 2’s complement data value, and 13-bit 2’s complement data value. When converting into the temperature the proper resolution must be
used as listed in Table 5 using either one of these two formulae:
1. If the Temp Data MSB = 0, then: Temp Value (°C) = +(Temp Data) × Value Resolution
2. If the Temp Data MSB = 1, then: Temp Value (°C) = –(2’s complement Temp Data) × Value Resolution
Table 6 shows some examples of the results for the 11-bit calculations.
Table 5. Temp Data and Temp Value resolution
Data resolution
8 bits
Value resolution
1.0 °C
9 bits
0.5 °C
10 bits
0.25 °C
11 bits
0.125 °C
0.0625 °C
0.03125 °C
12 bits
13 bits
11
2004 Dec 21
Philips Semiconductors
Product data sheet
Ultra high accuracy digital temperature sensor and
thermal Watchdog
SE95
Table 6. Temp table
Temp data
Temp value
11–bit Binary (2’s complement)
0111 1111 000
3-bit Hex
3F8h
3F7h
3F1h
3E8h
0C8h
001h
000h
7FFh
738h
649h
648h
Decimal value
°C
1016
1015
1009
1000
200
1
+127.000 °C
+126.875 °C
+126.125 °C
+125.000 °C
+25.000 °C
+0.125 °C
0.000 °C
0111 1110 111
0111 1110 001
0111 1101 000
0001 1001 000
0000 0000 001
0000 0000 000
1111 1111 111
0
–1
–0.125 °C
–25.000 °C
–54.875 °C
–55.000 °C
1110 0111 000
–200
–439
–440
11001001 001
1100 1001 000
Obviously, for 9-bit Temp data application in replacing the industry standard LM75, just use only 9 MSB bits of the two bytes and disregard
7 LSB bits of the LS byte. The 9-bit temp data with 0.5 °C resolution of the SE95 is defined exactly in the same way as for the standard LM75
and it is here similar to the Tos and Thyst that is described next.
Overtemp shut-down threshold (Tos) and hysteresis (Thyst) registers
These two registers are write/read registers, and also called set-point registers. They are used to store the user-defined temperature limits,
called overtemp shut-down threshold (Tos) and hysteresis (Thyst), for the device Watchdog operation. At the end of each conversion the Temp
data will be compared with the data stored in these two registers in order to set the state of the device OS output accordingly as described in the
“General operation” section.
Each of the set-point registers contains two 8-bit data bytes consisting of one MS data byte and one LS data byte the same as the Temp
register. However, only 9 bits of the two bytes are used to store the set-point data in 2’s complement format with the resolution of 0.5 °C. The
Tos register table (Table 7) and Thyst register table (Table 8) show the bit arrangement of the Tos data and Thyst data in the data bytes.
Notice that because only 9-bit data are used in the set-point registers, the device uses only the 9 MSB bits of the Temp data for data
comparison.
Table 7. Tos register table
Tos MS byte
Tos LS byte
MSB
LSB
MSB
LSB
B7
B6
D7
B5
D6
B4
B3
B2
B1
D2
B0
B7
B6
B5
B4
B3
B2
B1
B0
Tos data (9 bits)
Not used
MSB
LSB
D8
D5
D4
D3
D1
D0
X
X
X
X
X
X
X
Table 8. Thyst register table
Thyst MS byte
Thyst LS byte
MSB
LSB
MSB
LSB
B7
B6
B5
B4
B3
B2
B1
D2
B0
B7
B6
B5
B4
B3
B2
B1
B0
Thyst data (9 bits)
Not used
MSB
LSB
D8
D7
D6
D5
D4
D3
D1
D0
X
X
X
X
X
X
X
When a set-point register is read, all 16 bits are provided to the bus and must be collected by the controller to complete the bus operation.
However, only the 9 significant bits should be used and the 7 LSB bits of the LS byte are equal to zero and should be ignored.
The Tos and Thyst table (Table 9) shows examples of the limit data and value.
12
2004 Dec 21
Philips Semiconductors
Product data sheet
Ultra high accuracy digital temperature sensor and
thermal Watchdog
SE95
Table 9. Tos and Thyst table
Limit data
Limit temp value
11–bit Binary (2’s complement)
0111 1101 0
3-bit Hex
0FAh
032h
Decimal value
°C
250
50
+125.0 °C
+25.0 °C
+0.5 °C
0.0 °C
0001 1001 0
0000 0000 1
001h
1
0000 0000 0
000h
0
1111 1111 1
1FFh
1CEh
192h
–1
–0.5 °C
–25.0 °C
–55.0 °C
1110 0111 0
–50
–110
1100 1001 0
the configuration register. Notice that the programmed data and the
fault queue value are not the same. The Fault queue table
(Table 10) shows the one-to-one relationship between them. At
power-up, fault queue data = 0 and fault queue value = 1.
OS output and polarity
The OS output is an open-drain output and its state represents
results of the device Watchdog operation as described in the
“General operation” section. In order to observe this output state, an
external pull-up resistor is needed. The resistor should be as large
as possible, up 200 kΩ, to minimize the temp reading error due to
internal heating by the high OS sinking current.
Table 10. Fault queue table
Fault queue data
B4 B3
Fault queue value
The OS output active state can be selected as HIGH or LOW by
programming bit B2 of the Configuration register: setting B2 to 1
selects OS active HIGH and setting B2 to 0 sets OS active LOW.
At power-up, this bit is equal to 0 and the OS active state is LOW.
Decimal
0
0
1
2
4
6
0
1
1
1
0
1
OS comparator and interrupt modes
As described in the “General operation” section, the device OS
output responds to the result of the comparison between the Temp
data and the programmed limits, Tos and Thyst, in different ways
depending on the selected OS mode: OS comparator or OS
interrupt. The OS mode is selected by programming bit B1 of the
configuration register: setting B1 to 1 selects the OS interrupt mode,
and setting B1 to 0 selects the OS comparator mode. At power up,
this bit is equal to 0 and the OS comparator is selected.
Shutdown mode
The device operation mode is selected by programming bit B0 of the
Configuration register: Setting B0 to 1 will put the device into
shut-down mode. Resetting B0 to 0 will return the device to normal
mode.
The main difference between the two modes is that in OS
comparator mode, the OS output becomes active when the Temp
has exceeded the Tos and reset when the Temp has dropped below
the Thyst, reading a register or putting the device into shut-down
does not change the state of the OS output; while in OS interrupt
mode, once it has been activated either by exceeding the Tos or
dropping below the Thyst, the OS output will remain active
indefinitely until reading a register or putting the device into
shut-down occurs, then the OS output is reset.
In shut-down mode, the device draws a small current of about
7.5 µA and the power dissipation is minimized; the temperature
2
conversion stops, but the I C interface remains active and register
write/read operation can be performed. If the OS output is in
comparator mode, then it remains unchanged. In Interrupt mode, the
OS output is reset.
Power-up default and Power-on Reset
The SE95 always powers-up in its default state with:
– Normal operation mode
The Tos & Thyst limits must be selected so that Tos temp value >
Thyst temp value. Otherwise, the OS output state will be undefined.
– OS comparator mode
– Tos = 80 °C
OS fault queue
– Thyst = 75 °C
Fault queue is defined as the number of faults that must occur
consecutively to activate the OS output. It is provided to avoid false
tripping due to noise. Because faults are determined at the end of
data conversions, fault queue is also defined as the number of
consecutive conversions returning a temperature trip. The value of
fault queue is selectable by programming the two bits B4 and B3 of
– OS output active state = LOW
– Pointer value = 0.
When the power supply voltage is dropped below the device
power-on reset level of about 1.9 V (POR) and then rises up again,
the device will be reset to its default condition as listed above.
13
2004 Dec 21
Philips Semiconductors
Product data sheet
Ultra high accuracy digital temperature sensor and
thermal Watchdog
SE95
7. W: Write bit, when the Write/Read bit = LOW in a write
command.
Data communication
The communication between the host and the SE95 must strictly
2
follow the rules as defined by the I C-bus management. The
protocols for SE95 register read/write operations are illustrated by
the Figures as follows with these definitions:
8. R: Read bit, when the Write/Read bit = HIGH in a read
command.
9. A: Device Acknowledge bit, returned by the SE95. It is LOW if
the device works properly and HIGH if not. The host must
release the SDA line during this period in order to give the
device the control on the SDA line.
2
1. Before a communication, the I C-bus must be free or not busy. It
means that the SCL and SDA lines must be both released by all
devices on the bus, and they become HIGH by the bus pull-up
resistors.
10.A′ : Master Acknowledge bit, not returned by the device, but set
by the master or host in reading 2-byte data. During this clock
period, the host must set the SDA line to LOW in order to notice
the device that the first byte has been read for the device to
provide the second byte onto the bus.
2. The host must provide SCL clock pulses necessary for the
communication. Data is transferred in sequence of 9 SCL clock
pulses for every 8-bit data byte followed by 1-bit status of the
acknowledgement.
3. During data transfer, except the Start and Stop signals, the SDA
signal must be stable while the SCL signal is HIGH. It means
that SDA signal can be changed only during the LOW duration
of the SCL line.
11. NA: Not-Acknowledge bit. During this clock period, both the
device and host release the SDA line at the end of a data
transfer, the host is then enabled to generate the Stop signal.
12.In a write protocol, data is sent from the host to the device and
the host controls the SDA line, except during the clock period
when the device sends to the bus the device acknowledgement
signal.
4. S: Start signal, initiated by the host to start a communication,
the SDA goes from HIGH-to-LOW while the SCL is HIGH.
5. RS: Re-start signal, same as the Start signal, to start a read
command that follows a write command.
13.In a read protocol, data is sent to the bus by the device and the
host must release the SDA line during the time that the device is
providing data onto the bus and controlling the SDA line, except
during the clock period when the master sends to the bus the
master acknowledgement signal.
6. P: Stop signal, generated by the host to stop a communication,
the SDA goes from LOW-to-HIGH while the SCL is HIGH. The
bus becomes free thereafter.
14
2004 Dec 21
Philips Semiconductors
Product data sheet
Ultra high accuracy digital temperature sensor and
thermal Watchdog
SE95
Protocols for writing and reading the registers
1
1
2
0
3
0
4
1
5
6
7
8
9
1
0
2
0
3
0
4
0
5
0
6
0
7
0
8
1
9
1
0
2
0
3
0
4
5
6
7
8
9
SCL
SDA
S
A2 A1 A0
W
A
A
D4 D3 D2 D1 D0
A
P
DEVICE ADDRESS
POINTER BYTE
CONFIGURATION DATA BYTE
STOP
START
WRITE
DEVICE
ACKNOWLEDGE
DEVICE
ACKNOWLEDGE
DEVICE
ACKNOWLEDGE
SL01393
Figure 12. Write configuration register (1-byte data).
1
1
2
0
3
0
4
1
5
6
7
8
9
1
0
2
0
3
0
4
0
5
0
6
0
7
0
8
1
9
0
SCL
SDA
(next)
(next)
S
A2 A1 A0
W
A
A
RS
DEVICE ADDRESS
POINTER BYTE
START
WRITE
DEVICE
ACKNOWLEDGE
DEVICE
ACKNOWLEDGE
RE-START
1
1
2
0
3
0
4
1
5
6
7
8
9
1
2
3
4
5
6
7
8
9
SCL (cont.)
SDA (cont.)
A2 A1 A0
A
D7 D6 D5 D4 D3 D2 D1 D0 NA
DATA BYTE FROM DEVICE
P
R
DEVICE ADDRESS
STOP
READ
DEVICE
ACKNOWLEDGE
MASTER NOT
ACKNOWLEDGED
SL01398
Figure 13. Read configuration register including Pointer byte (1-byte data).
1
1
2
0
3
0
4
1
5
6
7
8
9
1
2
3
4
5
6
7
8
9
SCL
SDA
S
A2 A1 A0
A
D7 D6 D5 D4 D3 D2 D1 D0 NA
DATA BYTE FROM DEVICE
P
R
DEVICE ADDRESS
STOP
START
READ
DEVICE
ACKNOWLEDGE
MASTER NOT
ACKNOWLEDGED
SL01394
Figure 14. Read configuration register with preset Pointer (1-byte data).
15
2004 Dec 21
Philips Semiconductors
Product data sheet
Ultra high accuracy digital temperature sensor and
thermal Watchdog
SE95
1
1
2
0
3
0
4
1
5
6
7
8
9
1
0
2
0
3
0
4
0
5
0
6
0
7
8
9
SCL
SDA
(next)
(next)
S
A2 A1 A0
W
A
P1 P0
A
DEVICE ADDRESS
POINTER BYTE
START
1
WRITE
DEVICE
ACKNOWLEDGE
DEVICE
ACKNOWLEDGE
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
SCL (cont.)
SDA (cont.)
D7 D6 D5 D4 D3 D2 D1 D0
MS BYTE DATA
A
D7 D6 D5 D4 D3 D2 D1 D0
LS BYTE DATA
A
P
STOP
DEVICE
ACKNOWLEDGE
DEVICE
ACKNOWLEDGE
SL01397
Figure 15. Write Tos or Thyst register (2-byte data).
1
1
2
0
3
0
4
1
5
6
7
8
9
1
0
2
0
3
0
4
0
5
0
6
0
7
8
9
0
SCL
(next)
(next)
SDA
S
A2 A1 A0
W
A
P1 P0
A
RS
DEVICE ADDRESS
POINTER BYTE
START
WRITE
DEVICE
ACKNOWLEDGE
DEVICE
ACKNOWLEDGE
RE-START
1
1
2
0
3
0
4
1
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
SCL (cont.)
SDA (cont.)
A2 A1 A0
A
D7 D6 D5 D4 D3 D2 D1 D0 A′
D7 D6 D5 D4 D3 D2 D1 D0 NA
LS BYTE FROM DEVICE
P
R
DEVICE ADDRESS
MS BYTE FROM DEVICE
STOP
READ
DEVICE
ACKNOWLEDGE
MASTER
ACKNOWLEDGE
MASTER NOT
ACKNOWLEDGED
SL01396
Figure 16. Read Temp or Tos or Thyst register including Pointer byte (2-byte data).
1
1
2
0
3
0
4
1
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
SCL
SDA
S
A2 A1 A0
A
D7 D6 D5 D4 D3 D2 D1 D0 A′
D7 D6 D5 D4 D3 D2 D1 D0 NA
LS BYTE FROM DEVICE
P
R
DEVICE ADDRESS
MS BYTE FROM DEVICE
STOP
START
READ
DEVICE
ACKNOWLEDGE
MASTER
ACKNOWLEDGE
MASTER NOT
ACKNOWLEDGED
SL01395
Figure 17. Read Temp or Tos or Thyst register with preset Pointer (2-byte data).
16
2004 Dec 21
Philips Semiconductors
Product data sheet
Ultra high accuracy digital temperature sensor and
thermal Watchdog
SE95
SO8: plastic small outline package; 8 leads; body width 3.9 mm
SOT96-1
17
2004 Dec 21
Philips Semiconductors
Product data sheet
Ultra high accuracy digital temperature sensor and
thermal Watchdog
SE95
TSSOP8: plastic thin shrink small outline package; 8 leads; body width 3 mm
SOT505-1
18
2004 Dec 21
Philips Semiconductors
Product data sheet
Ultra high accuracy digital temperature sensor and
thermal Watchdog
SE95
REVISION HISTORY
Rev
Date
Description
_3
20041221
Product data sheet (9397 750 14388). Supersedes data of 2004 Oct 05 (9397 750 14163).
Modifications:
• ‘Features’ section on page 2,
nd
– 2 bullet: add “(MSOP8)” as package name variant for TSSOP8
rd
2
2
– 3 bullet: changed from “I C-bus interface with up to 8 devices on the same bus” to “I C-bus interface to
400 kHz with up to 8 devices on the same bus”
th
– 8 bullet: changed from “... from 0 °C to +100 °C” to “... from –25 °C to +100 °C”
th
– 12 bullet changed from “... 100 V MM per JESD22-A115” to “... 150 V MM per JESD22-A115”
• ‘Absolute maximum ratings’ table on page 4: changed V
• ‘DC electrical characteristics’ table on page 5:
Machine Model (max.) from ‘100 V’ to ‘150 V’
esd
– Symbol T
:
ACC
replaced “(assumes a minimum 11-bit temperature reading)” with “(Note 1)”
Conditions for V = 2.8 V to 3.6 V:
CC
changed “T
= –25 °C to 100 °C” to “T
= –25 °C to +100 °C”
amb
amb
changed “T
= –55 °C to –125 °C” to “T
= –55 °C to +125 °C”
amb
amb
_2
_1
20041005
20031002
Objective data sheet (9397 750 14163). Supersedes data of 2003 Oct 02 (9397 750 10265).
Objective data (9397 750 10265)
19
2004 Dec 21
Philips Semiconductors
Product data sheet
Ultra high accuracy digital temperature sensor and
thermal Watchdog
SE95
2
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
All rights reserved. Published in the U.S.A.
Contact information
For additional information please visit
http://www.semiconductors.philips.com.
Fax: +31 40 27 24825
Date of release: 12-04
For sales offices addresses send e-mail to:
sales.addresses@www.semiconductors.philips.com.
Document number:
9397 750 14388
Philips
Semiconductors
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