PCA9557 查看數據表（PDF） - Philips Electronics
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PCA9557 Datasheet PDF : 16 Pages
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Philips Semiconductors
8-bit I2C and SMBus I/0 port with reset
Product data
PCA9557
FEATURES
• Lower voltage, higher performance migration path for the
PCA9556
• 8 general purpose input/output expander/collector
• Input/output configuration register
• Active HIGH polarity inversion register
• I2C and SMBus interface logic
• Internal power-on reset
• Noise filter on SCL/SDA inputs
• Active LOW reset input
• 3 address pins allowing up to 8 devices on the I2C/SMBus
• High impedance open drain on I/O0
• No glitch on power-up
• Power-up with all channels configured as inputs
• Low standby current
• Operating power supply voltage range of 2.3 V to 5.5 V
• 5 V tolerant inputs/outputs
• 0 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 JESDEC Standard JESD78 which
exceeds 100 mA
• Package offer: SO 16, TSSOP 16
DESCRIPTION
The PCA9557 is a silicon CMOS circuit which provides parallel
input/output expansion for SMBus and I2C applications. The
PCA9557 consists of an 8-bit input port register, 8-bit output port
register, and an I2C/SMBus interface. It has low current
consumption and a high impedance open drain output pin, I/O0.
The system master can enable the PCA9557’s I/O as either input or
output by writing to the configuration register.
The system master can also invert the PCA9557 inputs by writing to
the active HIGH polarity inversion register.
Finally, the system master can reset the PCA9557 in the event of a
timeout by asserting a LOW in the reset input.
The power-on reset puts the registers in their default state and
initializes the I2C/SMBus state machine. The RESET pin causes the
same reset/initialization to occur without depowering the part.
PIN CONFIGURATION
SCL 1
SDA 2
A0 3
A1 4
A2 5
I/O0 6
I/O1 7
VSS 8
16 VDD
15 RESET
14 I/O7
13 I/O6
12 I/O5
11 I/O4
10 I/O3
9 I/O2
Figure 1. Pin configuration
su01045
PIN DESCRIPTION
PIN
NUMBER
SYMBOL
1
SCL
2
SDA
3
A0
4
A1
5
A2
6
I/O0
7
I/O1
8
VSS
9
I/O2
10
I/O3
11
I/O4
12
I/O5
13
I/O6
14
I/O7
15
RESET
16
VDD
FUNCTION
Serial clock line
Serial data line
Address input 0
Address input 1
Address input 2
I/O0 (open drain)
I/O1
Supply ground
I/O2
I/O3
I/O4
I/O5
I/O6
I/O7
Active low reset input
Supply voltage
ORDERING INFORMATION
PACKAGES
TEMPERATURE RANGE
ORDER CODE
16-Pin Plastic SO (narrow)
–40 to +85 °C
PCA9557D
16-Pin Plastic TSSOP
–40 to +85 °C
PCA9557PW
Standard packing quantities and other packaging data is available at www.philipslogic.com/packaging.
SMBus as specified by the Smart Battery System Implementers Forum is a derivative of the Philips I2C patent.
I2C is a trademark of Philips Semiconductors Corporation.
DRAWING NUMBER
SOT109-1
SOT403-1
2001 Dec 12
2
853-2308 27449
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