PCA9546APW_技术文档

PCA9546A

4-channel I²C switch with reset

Rev. 03 — 6 April 2005

Product data sheet

1. General description

The PCA9546A is a quad bi-directional translating switch controlled via the I²C-bus. The

SCL/SDA upstream pair fans out to four downstream pairs, or channels. Any individual

SCx/SDx channel or combination of channels can be selected, determined by the

contents of the programmable control register.

An active LOW reset input allows the PCA9546A to recover from a situation where one of

the downstream I²C-buses is stuck in a LOW state. Pulling the RESET pin LOW resets the

I²C-bus state machine and causes all the channels to be deselected as does the internal

Power-On Reset (POR) function.

The pass gates of the switches are constructed such that the V_DDpin can be used to limit

the maximum high voltage which will be passed by the PCA9546A. This allows the use of

different bus voltages on each pair, so that 1.8 V or 2.5 V or 3.3 V parts can communicate

with 5 V parts without any additional protection. External pull-up resistors pull the bus up

to the desired voltage level for each channel. All I/O pins are 5 V tolerant.

2. Features

■ 1-of-4 bi-directional translating switches

■ I²C-bus interface logic; compatible with SMBus standards

■ Active LOW reset input

■ 3 address pins allowing up to 8 devices on the I²C-bus

■ Channel selection via I²C-bus, in any combination

■ Power-up with all switch channels deselected

■ Low R_onswitches

■ Allows voltage level translation between 1.8 V, 2.5 V, 3.3 V and 5 V buses

■ No glitch on power-up

■ Supports hot insertion

■ Low stand-by current

■ Operating power supply voltage range of 2.3 V to 5.5 V

■ 5 V tolerant Inputs

■ 0 kHz to 400 kHz clock frequency

■ ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per

JESD22-A115, and 1000 V CDM per JESD22-C101

■ Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA

■ Three packages offered: SO16, TSSOP16, and HVQFN16

PCA9546A

Philips Semiconductors

4-channel I²C switch with reset

3. Ordering information

Table 1:

Ordering information

T_amb= −40 °C to +85 °C

Type number

Package

Name

Description

Version

PCA9546ABS

PCA9546AD

HVQFN16 plastic thermal enhanced very thin quad ﬂat package; SOT629-1

no leads; 16 terminals; body 4 × 4 × 0.85 mm

SO16

plastic small outline package; 16 leads;

body width 3.9 mm

SOT109-1

SOT403-1

PCA9546APW TSSOP16 plastic thin shrink small outline package; 16 leads;

body width 4.4 mm

Standard packing quantities and other packaging data are available at

www.standardics.philips.com/packaging.

4. Marking

Table 2:

Marking codes

Type number

PCA9546ABS

PCA9546AD

PCA9546APW

Topside mark

546A

PCA9546AD

PA9546A

9397 750 14318

Product data sheet

Rev. 03 — 6 April 2005

2 of 25

PCA9546A

Philips Semiconductors

4-channel I²C switch with reset

5. Block diagram

PCA9546A

SC0

SC1

SC2

SC3

SD0

SD1

SD2

SD3

V

SS

SWITCH CONTROL LOGIC

V

DD

POWER-ON

RESET

SCL

SDA

A0

A1

A2

INPUT

FILTER

2

I C-BUS

CONTROL

002aab188

Fig 1. Block diagram of PCA9546A

9397 750 14318

Product data sheet

Rev. 03 — 6 April 2005

3 of 25

PCA9546A

Philips Semiconductors

4-channel I²C switch with reset

6. Pinning information

6.1 Pinning

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

A0

A1

V

DD

SDA

SCL

A2

RESET

SD0

1

2

3

4

5

6

7

8

16

15

14

13

A0

A1

V

DD

SDA

SCL

A2

PCA9546AD

RESET

SD0

SC0

SC3

SD3

SC2

SD2

PCA9546APW

12 SC3

SD1

SC0

11

10

9

SD1

SD3

SC2

SD2

SC1

V

SS

V

SS

002aab185

002aab186

Fig 2. Pin conﬁguration for SO16

Fig 3. Pin conﬁguration for TSSOP16

terminal 1

index area

1

2

3

4

12

11

10

9

RESET

SD0

SCL

A2

PCA9546ABS

SC0

SC3

SD3

SD1

002aab187

Transparent top view

Fig 4. Pin conﬁguration for HVQFN16 (transparent top view)

9397 750 14318

Product data sheet

Rev. 03 — 6 April 2005

4 of 25

PCA9546A

Philips Semiconductors

4-channel I²C switch with reset

6.2 Pin description

Table 3:

Symbol

Pin description

Description

SO, TSSOP HVQFN

A0

1

15

16

1

address input 0

address input 1

active LOW reset input

serial data 0

A1

2

RESET

SD0

SC0

SD1

SC1

V_SS

3

4

2

5

3

serial clock 0

serial data 1

6

4

7

5

6^[1]

serial clock 1

supply ground

serial data 2

8

SD2

SC2

SD3

SC3

A2

9

7

10

11

12

13

14

15

16

8

serial clock 2

serial data 3

9

10

11

12

13

14

serial clock 3

address input 2

serial clock line

serial data line

supply voltage

SCL

SDA

V_DD

[1] HVQFN package die supply ground is connected to both the V_SSpin and the exposed center pad. The V_SS

pin must be connected to supply ground for proper device operation. For enhanced thermal, electrical, and

board-level performance, the exposed pad needs to be soldered to the board using a corresponding

thermal pad on the board, and for proper heat conduction through the board thermal vias need to be

incorporated in the PCB in the thermal pad region.

7. Functional description

Refer to Figure 1 “Block diagram of PCA9546A” on page 3.

7.1 Device address

Following a START condition, the bus master must output the address of the slave it is

accessing. The address of the PCA9546A is shown in Figure 5. To conserve power, no

internal pull-up resistors are incorporated on the hardware selectable address pins and

they must be pulled HIGH or LOW.

1

0

A2 A1 A0 R/W

fixed

hardware

selectable

002aab189

Fig 5. Slave address

The last bit of the slave address deﬁnes the operation to be performed. When set to

logic 1 a read is selected, while a logic 0 selects a write operation.

9397 750 14318

Product data sheet

Rev. 03 — 6 April 2005

5 of 25

PCA9546A

Philips Semiconductors

4-channel I²C switch with reset

7.2 Control register

Following the successful acknowledgement of the slave address, the bus master will send

a byte to the PCA9546A, which will be stored in the control register. If multiple bytes are

received by the PCA9546A, it will save the last byte received. This register can be written

and read via the I²C-bus.

channel selection bits

(read/write)

7

6

5

4

3

2

1

0

X

B3 B2 B1 B0

channel 0

channel 1

channel 2

channel 3

002aab190

Fig 6. Control register

7.2.1 Control register deﬁnition

One or several SCx/SDx downstream pair, or channel, is selected by the contents of the

control register. This register is written after the PCA9546A has been addressed. The

4 LSBs of the control byte are used to determine which channel is to be selected. When a

channel is selected, the channel will become active after a STOP condition has been

placed on the I²C-bus. This ensures that all SCx/SDx lines will be in a HIGH state when

the channel is made active, so that no false conditions are generated at the time of

connection.

Table 4:

D7

Control register: Write—channel selection; Read—channel status

D6

D5

D4

B3

B2

B1

B0

0

Command

channel 0 disabled

channel 0 enabled

channel 1 disabled

channel 1 enabled

channel 2 disabled

channel 2 enabled

channel 3 disabled

channel 3 enabled

X

1

0

1

X

0

1

X

0

1

0

X

0

X

0

X

0

X

0

X

0

X

0

X

0

no channel selected;

power-up/reset default state

Remark: Several channels can be enabled at the same time. Example: B3 = 0, B2 = 1,

B1 = 1, B0 = 0, means that channel 0 and channel 3 are disabled and channel 1 and

channel 2 are enabled. Care should be taken not to exceed the maximum bus

capacitance.

9397 750 14318

Product data sheet

Rev. 03 — 6 April 2005

6 of 25

PCA9546A

Philips Semiconductors

4-channel I²C switch with reset

7.3 RESET input

The RESET input is an active LOW signal which may be used to recover from a bus fault

condition. By asserting this signal LOW for a minimum of t_WL, the PCA9546A will reset its

registers and I²C-bus state machine and will deselect all channels. The RESET input must

be connected to V_DDthrough a pull-up resistor.

7.4 Power-on reset

When power is applied to V_DD, an internal Power-On Reset (POR) holds the PCA9546A in

a reset condition until V_DDhas reached V_POR. At this point, the reset condition is released

and the PCA9546A registers and I²C-bus state machine are initialized to their default

states—all zeroes—causing all the channels to be deselected. Thereafter, V_DDmust be

lowered below 0.2 V to reset the device.

7.5 Voltage translation

The pass gate transistors of the PCA9546A are constructed such that the V_DDvoltage can

be used to limit the maximum voltage that will be passed from one I²C-bus to another.

002aaa964

5.0

V

o(sw)

(V)

4.0

(1)

(2)

(3)

3.0

2.0

1.0

2.0

2.5

3.0

3.5

4.0

4.5

5.0

DD

5.5

(V)

V

(1) maximum

(2) typical

(3) minimum

Fig 7. Pass gate voltage versus supply voltage

Figure 7 shows the voltage characteristics of the pass gate transistors (note that the graph

was generated using the data speciﬁed in Section 11 “Static characteristics” of this data

sheet). In order for the PCA9546A to act as a voltage translator, the V_o(sw)voltage should

be equal to, or lower than the lowest bus voltage. For example, if the main bus was

running at 5 V, and the downstream buses were 3.3 V and 2.7 V, then V_o(sw)should be

equal to or below 2.7 V to effectively clamp the downstream bus voltages. Looking at

Figure 7, we see that V_o(sw)(max)will be at 2.7 V when the PCA9546A supply voltage is

3.5 V or lower, so the PCA9546A supply voltage could be set to 3.3 V. Pull-up resistors

can then be used to bring the bus voltages to their appropriate levels (see Figure 14).

9397 750 14318

Product data sheet

Rev. 03 — 6 April 2005

7 of 25

PCA9546A

Philips Semiconductors

4-channel I²C switch with reset

More Information can be found in Application Note AN262: PCA954X family of I2C/SMBus

multiplexers and switches.

8. Characteristics of the I²C-bus

The I²C-bus is for 2-way, 2-line communication between different ICs or modules. The two

lines are a serial data line (SDA) and a serial clock line (SCL). Both lines must be

connected to a positive supply via a pull-up resistor when connected to the output stages

of a device. Data transfer may be initiated only when the bus is not busy.

8.1 Bit transfer

One data bit is transferred during each clock pulse. The data on the SDA line must remain

stable during the HIGH period of the clock pulse as changes in the data line at this time

will be interpreted as control signals (see Figure 8).

SDA

SCL

data line

stable;

data valid

change

of data

allowed

mba607

Fig 8. Bit transfer

8.2 START and STOP conditions

Both data and clock lines remain HIGH when the bus is not busy. A HIGH-to-LOW

transition of the data line while the clock is HIGH is deﬁned as the START condition (S).

A LOW-to-HIGH transition of the data line while the clock is HIGH is deﬁned as the STOP

condition (P) (see Figure 9).

SDA

SCL

SDA

SCL

S

P

STOP condition

START condition

mba608

Fig 9. Deﬁnition of START and STOP conditions

8.3 System conﬁguration

A device generating a message is a ‘transmitter’, a device receiving is the ‘receiver’. The

device that controls the message is the ‘master’ and the devices which are controlled by

the master are the ‘slaves’ (see Figure 10).

9397 750 14318

Product data sheet

Rev. 03 — 6 April 2005

8 of 25

PCA9546A

Philips Semiconductors

4-channel I²C switch with reset

SDA

SCL

SLAVE

TRANSMITTER/

RECEIVER

MASTER

TRANSMITTER/

RECEIVER

2

SLAVE

RECEIVER

MASTER

TRANSMITTER

I C

TRANSMITTER/

MULTIPLEXER

RECEIVER

SLAVE

002aaa966

Fig 10. System conﬁguration

8.4 Acknowledge

The number of data bytes transferred between the START and the STOP conditions from

transmitter to receiver is not limited. Each byte of eight bits is followed by one

acknowledge bit. The acknowledge bit is a HIGH level put on the bus by the transmitter,

whereas the master generates an extra acknowledge related clock pulse.

A slave receiver which is addressed must generate an acknowledge after the reception of

each byte. Also, a master must generate an acknowledge after the reception of each byte

that has been clocked out of the slave transmitter. The device that acknowledges has to

pull down the SDA line during the acknowledge clock pulse so that the SDA line is stable

LOW during the HIGH period of the acknowledge related clock pulse; setup and hold

times must be taken into account.

A master receiver must signal an end of data to the transmitter by not generating an

acknowledge on the last byte that has been clocked out of the slave. In this event, the

transmitter must leave the data line HIGH to enable the master to generate a STOP

condition.

data output

by transmitter

not acknowledge

data output

by receiver

acknowledge

SCL from master

1

2

8

9

S

clock pulse for

START

condition

acknowledgement

002aaa987

Fig 11. Acknowledgement on the I²C-bus

9397 750 14318

Product data sheet

Rev. 03 — 6 April 2005

9 of 25

PCA9546A

Philips Semiconductors

4-channel I²C switch with reset

8.5 Bus transactions

Data is transmitted to the PCA9546A control register using the Write mode as shown in

Figure 12.

slave address

control register

SDA

S

1

0

A2 A1 A0

0

A

X

B3 B2 B1 B0

A

P

START condition

R/W acknowledge

from slave

acknowledge

from slave

STOP condition

002aab196

Fig 12. Write control register

Data is read from PCA9546A using the Read mode as shown in Figure 13.

last byte

slave address

control register

SDA

S

1

0

A2 A1 A0

1

A

X

B3 B2 B1 B0 NA

P

START condition

R/W acknowledge

from slave

no acknowledge

from master

STOP condition

002aab197

Fig 13. Read control register

9397 750 14318

Product data sheet

Rev. 03 — 6 April 2005

10 of 25

PCA9546A

Philips Semiconductors

4-channel I²C switch with reset

9. Application design-in information

V

= 2.7 V to 5.5 V

DD

V

= 3.3 V

DD

V = 2.7 V to 5.5 V

SDA

SCL

SDA

SCL

SD0

SC0

channel 0

V = 2.7 V to 5.5 V

RESET

2

I C/SMBus master

SD1

SC1

channel 1

V = 2.7 V to 5.5 V

PCA9546A

SD2

channel 2

SC2

V = 2.7 V to 5.5 V

A2

A1

A0

SD3

SC3

channel 3

V

SS

002aab198

Fig 14. Typical application

9397 750 14318

Product data sheet

Rev. 03 — 6 April 2005

11 of 25

PCA9546A

Philips Semiconductors

4-channel I²C switch with reset

10. Limiting values

Table 5:

Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134).

Voltages are referenced to V_SS(ground = 0 V). ^[1]

Symbol

V_DD

V_I

Parameter

Conditions

Min

Max

+7.0

±20

Unit

V

supply voltage

−0.5

input voltage

−0.5

V

I_I

input current

-

mA

mW

°C

I_O

output current

-

±25

I_DD

supply current

-

±100

400

I_SS

ground supply current

total power dissipation

storage temperature

operating ambient temperature

-

P_tot

T_stg

T_amb

-

−60

−40

+150

+85

°C

[1] The performance capability of a high-performance integrated circuit in conjunction with its thermal

environment can create junction temperatures which are detrimental to reliability. The maximum junction

temperature of this integrated circuit should not exceed 150 °C.

9397 750 14318

Product data sheet

Rev. 03 — 6 April 2005

12 of 25

PCA9546A

Philips Semiconductors

4-channel I²C switch with reset

11. Static characteristics

Table 6:

DC characteristics

V_DD= 2.3 V to 3.6 V; V_SS= 0 V; T_amb= −40 °C to +85 °C; unless otherwise speciﬁed.

See Table 7 on page 14 for V_DD= 4.5 V to 5.5 V. ^[1]

Symbol

Supply

V_DD

Parameter

Conditions

Min

Typ

Max

Unit

supply voltage

supply current

2.3

-

3.6

50

V

I_DD

Operating mode; V_DD= 3.6 V; no load;

V_I= V_DDor V_SS; f_SCL= 100 kHz

16

µA

I_stb

standby current

Standby mode; V_DD= 3.6 V; no load;

V_I= V_DDor V_SS

-

0.1

1.6

1

µA

[2]

V_POR

power-on reset voltage

no load; V_I= V_DDor V_SS

2.1

V

Input SCL; input/output SDA

V_IL

V_IH

I_OL

LOW-level input voltage

HIGH-level input voltage

−0.5

-

0.3V_DD

V

0.7V_DD

-

6

V

LOW-level output current V_OL= 0.4 V

V_OL= 0.6 V

3

-

mA

µA

pF

6

-

I_L

leakage current

V_I= V_DDor V_SS

−1

-

+1

13

C_i

input capacitance

V_I= V_SS

12

Select inputs A0 to A2, RESET

V_IL

LOW-level input voltage

HIGH-level input voltage

input leakage current

input capacitance

−0.5

0.7V_DD

−1

-

0.3V_DD

V

V_IH

-

V_DD+ 0.5

V

I_LI

pin at V_DDor V_SS

V_I= V_SS

-

+1

3

µA

pF

C_i

-

1.6

Pass gate

R_on

on-state resistance

switch output voltage

V_DD= 3.67 V; V_O= 0.4 V; I_O= 15 mA

5

7

11

16

30

55

Ω

V_DD= 2.3 V to 2.7 V; V_O= 0.4 V;

I_O= 10 mA

V_o(sw)

V_i(sw)= V_DD= 3.3 V; I_o(sw)= −100 µA

-

1.9

-

V

V_i(sw)= V_DD= 3.0 V to 3.6 V;

1.6

2.8

I

_o(sw)= −100 µA

V_i(sw)= V_DD= 2.5 V; I_o(sw)= −100 µA

-

1.5

-

V

V_i(sw)= V_DD= 2.3 V to 2.7 V;

1.1

2.0

I

_o(sw)= −100 µA

I_L

leakage current

V_I= V_DDor V_SS

−1

-

+1

5

µA

C_io

input/output capacitance V_I= V_SS

-

3

pF

[1] For operation between published voltage ranges, refer to the worst-case parameter in both ranges.

[2] V_DDmust be lowered to 0.2 V in order to reset part.

9397 750 14318

Product data sheet

Rev. 03 — 6 April 2005

13 of 25

PCA9546A

Philips Semiconductors

4-channel I²C switch with reset

Table 7:

DC characteristics

V_DD= 4.5 V to 5.5 V; V_SS= 0 V; T_amb= −40 °C to +85 °C; unless otherwise speciﬁed.

See Table 6 on page 13 for V_DD= 2.3 V to 3.6 V. ^[1]

Symbol

Supply

V_DD

Parameter

Conditions

Min

Typ

Max

Unit

supply voltage

supply current

4.5

-

5.5

V

I_DD

Operating mode; V_DD= 5.5 V;

65

100

µA

no load; V_I= V_DDor V_SS

;

f_SCL= 100 kHz

I_stb

standby current

Standby mode; V_DD= 5.5 V;

no load; V_I= V_DDor V_SS

-

0.3

1.7

1

µA

[2]

V_POR

power-on reset voltage

no load; V_I= V_DDor V_SS

2.1

V

Input SCL; input/output SDA

V_IL

V_IH

I_OL

LOW-level input voltage

HIGH-level input voltage

−0.5

-

0.3V_DD

V

0.7V_DD

-

6

-

V

LOW-level output current V_OL= 0.4 V

V_OL= 0.6 V

3

6

1

-

mA

µA

pF

-

I_IL

I_IH

C_i

LOW-level input current

HIGH-level input current

input capacitance

V_I= V_SS

V_I= V_DD

V_I= V_SS

-

1

13

-

12

Select inputs A0 to A2, RESET

V_IL

LOW-level input voltage

HIGH-level input voltage

input leakage current

input capacitance

−0.5

0.7V_DD

−1

-

0.3V_DD

V

V_IH

-

V_DD+ 0.5

V

I_LI

pin at V_DDor V_SS

V_I= V_SS

-

+1

3

µA

pF

C_i

-

2

Pass gate

R_on

on-state resistance

switch output voltage

V_DD= 4.5 V to 5.5 V; V_O= 0.4 V;

I_O= 15 mA

4

9

24

-

Ω

V

V_o(sw)

V_i(sw)= V_DD= 5.0 V;

-

3.6

-

I

_o(sw)= −100 µA

V_i(sw)= V_DD= 4.5 V to 5.5 V;

_o(sw)= −100 µA

V_I= V_DDor V_SS

2.6

4.5

I

I_L

leakage current

−1

-

+1

5

µA

C_io

input/output capacitance V_I= V_SS

-

3

pF

[1] For operation between published voltage ranges, refer to the worst-case parameter in both ranges.

[2] V_DDmust be lowered to 0.2 V in order to reset part.

9397 750 14318

Product data sheet

Rev. 03 — 6 April 2005

14 of 25

PCA9546A

Philips Semiconductors

4-channel I²C switch with reset

12. Dynamic characteristics

Table 8:

Dynamic characteristics

Symbol Parameter

Conditions

Standard-mode

I²C-bus

Fast-mode I²C-bus Unit

Min Max

Min

Max

t_PD

propagation delay from SDA to SDn, or

-

0.3^[1]

-

0.3 ^[1]

ns

SCL to SCn

f_SCL

t_BUF

SCL clock frequency

0

100

-

0

400

-

kHz

bus free time between a STOP and

START condition

4.7

1.3

µs

t_HD;STA

hold time (repeated) START condition.

After this period, the ﬁrst clock pulse is

generated.

4.0

-

0.6

-

µs

t_LOW

LOW period of the SCL clock

HIGH period of the SCL clock

4.7

4.0

4.7

-

1.3

0.6

-

µs

t_HIGH

t_SU;STA

setup time for a repeated START

condition

t_SU;STO

t_HD;DAT

t_SU;DAT

t_r

setup time for STOP condition

data hold time

4.0

0^[2]

-

0.6

0^[2]

-

µs

ns

µs

ns

3.45

-

0.9

-

data setup time

250

100

[3]

rise time of both SDA and SCL signals

fall time of both SDA and SCL signals

capacitive load for each bus line

-

1000 20 + 0.1C_b

300

400

50

t_f

300

400

50

20 + 0.1C_b

C_b

-

t_SP

pulse width of spikes which must be

suppressed by the input ﬁlter

[4]

t_VD;DAT

data valid time

HIGH-to-LOW

LOW-to-HIGH

-

1

-

1

µs

0.6

1

0.6

1

t_VD;ACK

RESET

t_w(rst)L

t_rst

data valid Acknowledge

LOW-level reset time

4

-

4

-

ns

reset time (SDA clear)

500

0

500

0

t_REC;STA

recovery time to START condition

[1] Pass gate propagation delay is calculated from the 20 Ω typical R_onand the 15 pF load capacitance.

[2] A device must internally provide a hold time of at least 300 ns for the SDA signal (referred to the V_IH(min)of the SCL signal) in order to

bridge the undeﬁned region of the falling edge of SCL.

[3] C_b= total capacitance of one bus line in pF.

[4] Measurements taken with 1 kΩ pull-up resistor and 50 pF load.

9397 750 14318

Product data sheet

Rev. 03 — 6 April 2005

15 of 25

PCA9546A

Philips Semiconductors

4-channel I²C switch with reset

SDA

t

r

f

HD;STA

SP

BUF

t

LOW

SCL

t

SU;STO

HD;STA

SU;STA

t

SU;DAT

HD;DAT

HIGH

P

S

Sr

P

002aaa986

Fig 15. Deﬁnition of timing on the I²C-bus

ACK or read cycle

START

SCL

SDA

30 %

t

rst

RESET

LEDx

50 %

t

REC;STA

t

w(rst)L

t

rst

50 %

LED off

002aab174

Fig 16. Deﬁnition of RESET timing

START

condition

(S)

bit 7

MSB

(A7)

STOP

condition

(P)

bit 6

(A6)

bit 0 acknowledge

(R/W) (A)

protocol

t

HIGH

SU;STA

LOW

1

/f

SCL

SDA

t

BUF

f

t

r

t

HD;DAT

VD;DAT

VD;ACK

SU;STO

002aab175

HD;STA

SU;DAT

Rise and fall times refer to V_ILand V_IH

.

Fig 17. I²C-bus timing diagram

9397 750 14318

Product data sheet

Rev. 03 — 6 April 2005

16 of 25

PCA9546A

Philips Semiconductors

4-channel I²C switch with reset

13. Package outline

SO16: plastic small outline package; 16 leads; body width 3.9 mm

SOT109-1

D

E

A

X

c

y

H

v

M

A

E

Z

16

9

Q

A

2

A

(A )

3

A

1

pin 1 index

θ

L

p

L

1

8

e

w

M

detail X

b

p

0

2.5

scale

5 mm

DIMENSIONS (inch dimensions are derived from the original mm dimensions)

A

(1)

UNIT

A

b

c

D

E

e

H

L

p

Q

v

w

y

Z

θ

1

2

3

p

E

max.

0.25

0.10

1.45

1.25

0.49

0.36

0.25

0.19

10.0

9.8

4.0

3.8

6.2

5.8

1.0

0.4

0.7

0.6

0.7

0.3

mm

1.27

0.05

1.05

0.041

1.75

0.25

0.01

0.25

0.01

0.25

0.1

8^o

0^o

0.010 0.057

0.004 0.049

0.019 0.0100 0.39

0.014 0.0075 0.38

0.16

0.15

0.244

0.228

0.039 0.028

0.016 0.020

0.028

0.012

inches

0.069

0.01 0.004

Note

1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included.

REFERENCES

OUTLINE

EUROPEAN

PROJECTION

ISSUE DATE

VERSION

IEC

JEDEC

JEITA

99-12-27

03-02-19

SOT109-1

076E07

MS-012

Fig 18. Package outline SOT109-1 (SO16)

9397 750 14318

Product data sheet

Rev. 03 — 6 April 2005

17 of 25

PCA9546A

Philips Semiconductors

4-channel I²C switch with reset

TSSOP16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm

SOT403-1

D

E

A

X

c

y

H

v

M

A

E

Z

9

16

Q

(A )

3

A

2

A

1

pin 1 index

θ

L

p

L

1

8

detail X

w

M

b

p

e

0

2.5

5 mm

scale

DIMENSIONS (mm are the original dimensions)

A

(1)

(2)

(1)

UNIT

A

b

c

D

E

e

H

L

Q

v

w

y

Z

θ

1

2

3

p

E

p

max.

8^o

0^o

0.15

0.05

0.95

0.80

0.30

0.19

0.2

0.1

5.1

4.9

4.5

4.3

6.6

6.2

0.75

0.50

0.4

0.3

0.40

0.06

mm

1.1

0.65

0.25

1

0.2

0.13

0.1

Notes

1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.

2. Plastic interlead protrusions of 0.25 mm maximum per side are not included.

REFERENCES

OUTLINE

EUROPEAN

PROJECTION

ISSUE DATE

VERSION

IEC

JEDEC

JEITA

99-12-27

03-02-18

SOT403-1

MO-153

Fig 19. Package outline SOT403-1 (TSSOP16)

9397 750 14318

Product data sheet

Rev. 03 — 6 April 2005

18 of 25

PCA9546A

Philips Semiconductors

4-channel I²C switch with reset

HVQFN16: plastic thermal enhanced very thin quad flat package; no leads;

16 terminals; body 4 x 4 x 0.85 mm

SOT629-1

B

A

D

terminal 1

index area

A

1

E

c

detail X

e

1

C

1/2 e

y

e

v

M

b

C

A B

C

1

w

5

8

L

9

4

1

e

E

h

2

1/2 e

12

terminal 1

index area

16

13

X

D

h

0

2.5

scale

5 mm

DIMENSIONS (mm are the original dimensions)

(1)

A

(1)

UNIT

A

b

c

E

e

1

e

2

y

D

E

L

v

w

y

1

h

max.

0.05 0.38

0.00 0.23

4.1

3.9

2.25

1.95

4.1

3.9

2.25

1.95

0.75

0.50

mm

0.05

0.1

1

0.2

0.65

1.95 1.95

0.1 0.05

Note

1. Plastic or metal protrusions of 0.075 mm maximum per side are not included.

REFERENCES

OUTLINE

EUROPEAN

PROJECTION

ISSUE DATE

VERSION

IEC

JEDEC

JEITA

01-08-08

02-10-22

SOT629-1

- - -

MO-220

- - -

Fig 20. Package outline SOT629-1 (HVQFN16)

9397 750 14318

Product data sheet

Rev. 03 — 6 April 2005

19 of 25

PCA9546A

Philips Semiconductors

4-channel I²C switch with reset

14. Soldering

14.1 Introduction to soldering surface mount packages

This text gives a very brief insight to a complex technology. A more in-depth account of

soldering ICs can be found in our Data Handbook IC26; Integrated Circuit Packages

(document order number 9398 652 90011).

There is no soldering method that is ideal for all surface mount IC packages. Wave

soldering can still be used for certain surface mount ICs, but it is not suitable for ﬁne pitch

SMDs. In these situations reﬂow soldering is recommended.

14.2 Reﬂow soldering

Reﬂow soldering requires solder paste (a suspension of ﬁne solder particles, ﬂux and

binding agent) to be applied to the printed-circuit board by screen printing, stencilling or

pressure-syringe dispensing before package placement. Driven by legislation and

environmental forces the worldwide use of lead-free solder pastes is increasing.

Several methods exist for reﬂowing; for example, convection or convection/infrared

heating in a conveyor type oven. Throughput times (preheating, soldering and cooling)

vary between 100 seconds and 200 seconds depending on heating method.

Typical reﬂow peak temperatures range from 215 °C to 270 °C depending on solder paste

material. The top-surface temperature of the packages should preferably be kept:

• below 225 °C (SnPb process) or below 245 °C (Pb-free process)

– for all BGA, HTSSON..T and SSOP..T packages

– for packages with a thickness ≥ 2.5 mm

– for packages with a thickness < 2.5 mm and a volume ≥ 350 mm³so called

thick/large packages.

• below 240 °C (SnPb process) or below 260 °C (Pb-free process) for packages with a

thickness < 2.5 mm and a volume < 350 mm³so called small/thin packages.

Moisture sensitivity precautions, as indicated on packing, must be respected at all times.

14.3 Wave soldering

Conventional single wave soldering is not recommended for surface mount devices

(SMDs) or printed-circuit boards with a high component density, as solder bridging and

non-wetting can present major problems.

To overcome these problems the double-wave soldering method was speciﬁcally

developed.

If wave soldering is used the following conditions must be observed for optimal results:

• Use a double-wave soldering method comprising a turbulent wave with high upward

pressure followed by a smooth laminar wave.

• For packages with leads on two sides and a pitch (e):

– larger than or equal to 1.27 mm, the footprint longitudinal axis is preferred to be

parallel to the transport direction of the printed-circuit board;

9397 750 14318

Product data sheet

Rev. 03 — 6 April 2005

20 of 25

PCA9546A

Philips Semiconductors

4-channel I²C switch with reset

– smaller than 1.27 mm, the footprint longitudinal axis must be parallel to the

transport direction of the printed-circuit board.

The footprint must incorporate solder thieves at the downstream end.

• For packages with leads on four sides, the footprint must be placed at a 45° angle to

the transport direction of the printed-circuit board. The footprint must incorporate

solder thieves downstream and at the side corners.

During placement and before soldering, the package must be ﬁxed with a droplet of

adhesive. The adhesive can be applied by screen printing, pin transfer or syringe

dispensing. The package can be soldered after the adhesive is cured.

Typical dwell time of the leads in the wave ranges from 3 seconds to 4 seconds at 250 °C

or 265 °C, depending on solder material applied, SnPb or Pb-free respectively.

A mildly-activated ﬂux will eliminate the need for removal of corrosive residues in most

applications.

14.4 Manual soldering

Fix the component by ﬁrst soldering two diagonally-opposite end leads. Use a low voltage

(24 V or less) soldering iron applied to the ﬂat part of the lead. Contact time must be

limited to 10 seconds at up to 300 °C.

When using a dedicated tool, all other leads can be soldered in one operation within

2 seconds to 5 seconds between 270 °C and 320 °C.

14.5 Package related soldering information

Table 9:

Package ^[1]

Suitability of surface mount IC packages for wave and reﬂow soldering methods

Soldering method

Wave

Reﬂow^[2]

BGA, HTSSON..T^[3], LBGA, LFBGA, SQFP,

SSOP..T^[3], TFBGA, VFBGA, XSON

not suitable

suitable

DHVQFN, HBCC, HBGA, HLQFP, HSO, HSOP,

HSQFP, HSSON, HTQFP, HTSSOP, HVQFN,

HVSON, SMS

not suitable^[4]

suitable

PLCC^[5], SO, SOJ

suitable

LQFP, QFP, TQFP

not recommended^{[5] [6]}

not recommended^[7]

not suitable

suitable

SSOP, TSSOP, VSO, VSSOP

CWQCCN..L^[8], PMFP^[9], WQCCN..L^[8]

suitable

not suitable

[1] For more detailed information on the BGA packages refer to the (LF)BGA Application Note (AN01026);

order a copy from your Philips Semiconductors sales ofﬁce.

[2] All surface mount (SMD) packages are moisture sensitive. Depending upon the moisture content, the

maximum temperature (with respect to time) and body size of the package, there is a risk that internal or

external package cracks may occur due to vaporization of the moisture in them (the so called popcorn

effect). For details, refer to the Drypack information in the Data Handbook IC26; Integrated Circuit

Packages; Section: Packing Methods.

[3] These transparent plastic packages are extremely sensitive to reﬂow soldering conditions and must on no

account be processed through more than one soldering cycle or subjected to infrared reﬂow soldering with

peak temperature exceeding 217 °C ± 10 °C measured in the atmosphere of the reﬂow oven. The package

body peak temperature must be kept as low as possible.

9397 750 14318

Product data sheet

Rev. 03 — 6 April 2005

21 of 25

PCA9546A

Philips Semiconductors

4-channel I²C switch with reset

[4] These packages are not suitable for wave soldering. On versions with the heatsink on the bottom side, the

solder cannot penetrate between the printed-circuit board and the heatsink. On versions with the heatsink

on the top side, the solder might be deposited on the heatsink surface.

[5] If wave soldering is considered, then the package must be placed at a 45° angle to the solder wave

direction. The package footprint must incorporate solder thieves downstream and at the side corners.

[6] Wave soldering is suitable for LQFP, QFP and TQFP packages with a pitch (e) larger than 0.8 mm; it is

deﬁnitely not suitable for packages with a pitch (e) equal to or smaller than 0.65 mm.

[7] Wave soldering is suitable for SSOP, TSSOP, VSO and VSSOP packages with a pitch (e) equal to or larger

than 0.65 mm; it is deﬁnitely not suitable for packages with a pitch (e) equal to or smaller than 0.5 mm.

[8] Image sensor packages in principle should not be soldered. They are mounted in sockets or delivered

pre-mounted on ﬂex foil. However, the image sensor package can be mounted by the client on a ﬂex foil by

using a hot bar soldering process. The appropriate soldering proﬁle can be provided on request.

[9] Hot bar soldering or manual soldering is suitable for PMFP packages.

15. Abbreviations

Table 10: Abbreviations

Acronym

CDM

ESD

HBM

IC

Description

Charged Device Model

Electro Static Discharge

Human Body Model

Integrated Circuit

LSB

Least Signiﬁcant Bit

Machine Model

MM

MSB

PCB

Most Signiﬁcant Bit

Printed-Circuit Board

16. Revision history

Table 11: Revision history

Document ID

PCA9546A_3

Modiﬁcations:

Release date Data sheet status

20050406 Product data sheet

Change notice

Doc. number

Supersedes

-

9397 750 14318 PCA9546A_2

• The format of this data sheet has been redesigned to comply with the new presentation and

information standard of Philips Semiconductors.

• Section 2 “Features” on page 1:

–

7th bullet: changed ‘RDS_ON’ to ‘R_on’

–

16th bullet: changed ‘JESDEC’ to ‘JEDEC’

• Figure 4 “Pin conﬁguration for HVQFN16 (transparent top view)” on page 4:

–

added pin 1 indicator notch and center pad

–

changed pin 1 from ‘A2’ to ‘RESET’

• Section 6.2 “Pin description” on page 5: added Table note 1 and its reference at HVQFN pin 6.

• Section 7.2.1 “Control register deﬁnition” on page 6, third sentence: changed ‘The 2 LSBs of the

control byte ...’ to ‘The 4 LSBs of the control byte ...’

• Section 7.5 “Voltage translation” on page 7:

–

Figure 7 modiﬁed and title changed from ‘V_passvoltage versus V_DD’ to ‘Pass gate voltage versus

supply voltage’

–

2nd paragraph: changed symbol ‘V_pass’ and ‘V_pass(max)’ to ‘V_o(sw)’ and ‘V_o(sw)(max)’, respectively.

9397 750 14318

Product data sheet

Rev. 03 — 6 April 2005

22 of 25

PCA9546A

Philips Semiconductors

4-channel I²C switch with reset

Table 11: Revision history …continued

Document ID

Release date Data sheet status

Change notice

Doc. number

Supersedes

Modiﬁcations

(continued):

• Added Section 8.5 “Bus transactions” on page 10; moved Figure 12 “Write control register” and

Figure 13 “Read control register” to this section.

• Table 5 “Limiting values” on page 12:

–

In the description line below table title, changed ‘referenced to GND’ to ‘referenced to V_SS

’

–

Removed (old) table note [1], as this statement is now covered in Section 19 “Disclaimers”

• Table 6 “DC characteristics” on page 13:

–

added (new) Table note 1

changed symbol ‘R_ON’ to ‘R_on’ and its parameter from ‘switch resistance’ to ‘on-state resistance’

changed symbol ‘V_pass’ to ‘V_o(sw)

’

under Conditions column: changed ‘V_swin’ to ‘V_i(sw)’; changed ‘I_swout’ to I_o(sw)

’

• Table 7 “DC characteristics” on page 14:

–

added (new) Table note 1

sub-section ‘Select inputs A0 to A2, RESET’: changed I_LI(max)from ‘+50 µA’ to ‘+1 µA’.

sub-section ‘Pass gate’: changed I_L(min)from ‘−10 µA’ to ‘−1 µA’;

changed I_L(max)from ‘+100 µA’ to ‘+1 µA’

–

changed symbol ‘R_ON’ to ‘R_on’ and its parameter from ‘switch resistance’ to ‘on-state resistance’

changed symbol ‘V_pass’ to ‘V_o(sw)

’

under Conditions column: changed ‘V_swin’ to ‘V_i(sw)’; changed ‘I_swout’ to I_o(sw)

’

• Table 8 “Dynamic characteristics” on page 15:

–

symbol ‘t_R’ changed to ‘t_r’; symbol ‘t_F’ changed to ‘t_f’

–

changed symbols ‘t_VD;DATL’ and ‘t_VD;DATH’ to ‘t_VD;DAT’ and added Conditions indicating

HIGH-to-LOW and LOW-to-HIGH transitions

–

changed symbol ‘t_WL(rst)’ to ‘t_w(rst)L’

changed parameter for symbol t_REC;STAfrom ‘recovery to START’ to ‘recovery time to START

condition’

–

in Table note 1: changed ‘R_ON’ to ‘R_on’

• Added Figure 16 and Figure 17

• Added Section 15 “Abbreviations”

PCA9546A_2

PCA9546A_1

20040929

Objective data sheet

-

9397 750 13991 PCA9546A_1

9397 750 13308

20040728

Objective data sheet

-

9397 750 14318

Product data sheet

Rev. 03 — 6 April 2005

23 of 25

PCA9546A

Philips Semiconductors

4-channel I²C switch with reset

17. Data sheet status

Level Data sheet status^[1]Product status^{[2] [3]}

Deﬁnition

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

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

Production

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]

[2]

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

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.

18. Deﬁnitions

19. Disclaimers

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.

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.

Limiting values deﬁnition — 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.

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 via a Customer Product/Process

Change Notiﬁcation (CPCN). Philips Semiconductors assumes no

responsibility or liability for the use of any of these products, conveys no

license or title under any patent, copyright, or mask work right to these

products, and makes no representations or warranties that these products are

free from patent, copyright, or mask work right infringement, unless otherwise

speciﬁed.

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.

20. Contact information

For additional information, please visit: http://www.semiconductors.philips.com

For sales ofﬁce addresses, send an email to: sales.addresses@www.semiconductors.philips.com

9397 750 14318

Product data sheet

Rev. 03 — 6 April 2005

24 of 25

PCA9546A

Philips Semiconductors

4-channel I²C switch with reset

21. Contents

1

2

3

4

5

General description . . . . . . . . . . . . . . . . . . . . . . 1

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Ordering information. . . . . . . . . . . . . . . . . . . . . 2

Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3

6

6.1

6.2

Pinning information. . . . . . . . . . . . . . . . . . . . . . 4

Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 5

7

Functional description . . . . . . . . . . . . . . . . . . . 5

Device address. . . . . . . . . . . . . . . . . . . . . . . . . 5

Control register . . . . . . . . . . . . . . . . . . . . . . . . . 6

Control register deﬁnition . . . . . . . . . . . . . . . . . 6

RESET input. . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Power-on reset . . . . . . . . . . . . . . . . . . . . . . . . . 7

Voltage translation . . . . . . . . . . . . . . . . . . . . . . 7

7.1

7.2

7.2.1

7.3

7.4

7.5

8

Characteristics of the I²C-bus. . . . . . . . . . . . . . 8

Bit transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

START and STOP conditions . . . . . . . . . . . . . . 8

System conﬁguration . . . . . . . . . . . . . . . . . . . . 8

Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Bus transactions . . . . . . . . . . . . . . . . . . . . . . . 10

8.1

8.2

8.3

8.4

8.5

9

Application design-in information . . . . . . . . . 11

Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 12

Static characteristics. . . . . . . . . . . . . . . . . . . . 13

Dynamic characteristics . . . . . . . . . . . . . . . . . 15

Package outline . . . . . . . . . . . . . . . . . . . . . . . . 17

10

11

12

13

14

14.1

Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Introduction to soldering surface mount

packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Reﬂow soldering . . . . . . . . . . . . . . . . . . . . . . . 20

Wave soldering . . . . . . . . . . . . . . . . . . . . . . . . 20

Manual soldering . . . . . . . . . . . . . . . . . . . . . . 21

Package related soldering information . . . . . . 21

14.2

14.3

14.4

14.5

15

16

17

18

19

20

Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . 22

Revision history. . . . . . . . . . . . . . . . . . . . . . . . 22

Data sheet status . . . . . . . . . . . . . . . . . . . . . . . 24

Deﬁnitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Contact information . . . . . . . . . . . . . . . . . . . . 24

All rights are reserved. Reproduction in whole or in part is prohibited without the prior

written consent of the copyright owner. The information presented in this document does

not form part of any quotation or contract, is believed to be accurate and reliable and may

be changed without notice. No liability will be accepted by the publisher for any

consequence of its use. Publication thereof does not convey nor imply any license under

patent- or other industrial or intellectual property rights.

Date of release: 6 April 2005

Document number: 9397 750 14318

Published in The Netherlands


型号：	PCA9546APW
厂家：	NXP
描述：	4-channel I2C switch with reset 带复位4通道I2C开关解复用器开关逻辑集成电路光电二极管
文件：	总25页 (文件大小：141K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

PCA9546APW [NXP]

相关型号：

PCA9546APW,118

PCA9546APWE4

PCA9546APWG4

PCA9546APWR

PCA9546APWRE4

PCA9546APWRG4

PCA9546APWT

PCA9546APWTE4

PCA9546APWTG4

PCA9546ARGVR

PCA9546ARGVRG4

PCA9546ARGWR