9557 查看數據表（PDF） - NXP Semiconductors.
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9557 Datasheet PDF : 26 Pages
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NXP Semiconductors
PCA9557
8-bit I2C-bus and SMBus I/O port with reset
Table 3.
Symbol
VSS
IO2
IO3
IO4
IO5
IO6
IO7
RESET
VDD
Pin description …continued
Pin
Description
SO16, TSSOP16 HVQFN16
8
6[1]
supply ground
9
7
input/output 2
10
8
input/output 3
11
9
input/output 4
12
10
input/output 5
13
11
input/output 6
14
12
input/output 7
15
13
active LOW reset input
16
14
supply voltage
[1] HVQFN16 package die supply ground is connected to both the VSS pin and the exposed center pad. The
VSS pin must be connected to the 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.
6. System diagram
RESET
1.1 kΩ
SCL
1.6 kΩ
SDA
1.6 kΩ
1.1 kΩ
or
A2
1.1 kΩ
or
A1
1.1 kΩ
or
A0
I2C-BUS/SMBus
INTERFACE
LOGIC
INPUT
PORT
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
POLARITY
INVERSION
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
CONFIG.
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
OUTPUT
PORT
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
Fig 7. System diagram
1.1 kΩ
IO0
IO1
IO2
IO3
IO4
IO5
IO6
IO7
002aad276
PCA9557
Product data sheet
Rev. 06 — 11 June 2008
© NXP B.V. 2008. All rights reserved.
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