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參數(shù)資料
| 型號(hào)： | 935262899118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8 I/O, PIA-GENERAL PURPOSE, PDSO16 |
| 封裝： | PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 144K |
| 代理商： | 935262899118 |
Philips Semiconductors
Product specification
PCA9556
Octal SMBus Registered Interface
2
1998 Dec 18
853-2138 20549
FEATURES
SMBus compliance with fixed 3.3V voltage levels
Operating power supply voltage range of 3.0V – 3.6V
Active high polarity inverter register
Write protect register
Active low reset pin
Low leakage current on power-down
Noise filter on SCL/SDA inputs
No glitch on power-up
Internal power-on reset
8 I/O pins which default to 8 inputs
High impedance open drain on I/O
DESCRIPTION
The PCA9556 is a silicon CMOS circuit which provides parallel
input/output expansion for SMBus applications. The PCA9556
consists of an 8-bit input port register, 8-bit output port register, and
an SMBus interface. It has low current consumption and a high
impedance open drain output pin, I/O0.
The SMBus system master can reset the PCA9556 in the event of a
timeout by asserting a LOW on the reset input. The SMBus system
master can also invert the PCA9556 inputs by writing to their active
HIGH polarity inversion bits. Finally, the SMBus system master can
enable the PCA9556’s I/Os as either inputs or outputs by writing to
their I/O configuration bits.
The power-on reset sets the registers to their default values and
initializes the SMBus state machine. The RESET pin causes the
same reset/initialization to occur without depowering the part.
PIN CONFIGURATION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
su01045
SCL
SDA
A0
A1
A2
I/O0
I/O1
VSS
VDD
RESET
I/O7
I/O6
I/O5
I/O4
I/O3
I/O2
Figure 1. Pin configuration
PIN DESCRIPTION
PIN
NUMBER
SYMBOL
FUNCTION
1
SCL
Serial clock line
2
SDA
Serial data line
3
A0
Address input 0
4
A1
Address input 1
5
A2
Address input 2
6
I/O0
I/O0 (open drain)
7
I/O1
8
VSS
Supply GROUND
9
I/O2
10
I/O3
11
I/O4
12
I/O5
13
I/O6
14
I/O7
15
RESET
External reset (active LOW)
16
VDD
Supply voltage
ORDERING INFORMATION
PACKAGES
TEMPERATURE RANGE
OUTSIDE NORTH AMERICA
DRAWING NUMBER
16-Pin Plastic TSSOP16 Type I
0
°C to +70°C
PCA9556 PW
SOT403-1
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