pca9506 NXP Semiconductors, pca9506 Datasheet - Page 7

• Manufacturer Part Number: pca9506
• Description: 40-bit I2c-bus I/o Port With Reset, Oe, And Int
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7. Functional description
9397 750 14939
Product data sheet
7.1 Device address
7.2 Command register
Table 2:
[1]
Refer to
IO0_0 to
Following a START condition, the bus master must send the address of the slave it is
accessing and the operation it wants to perform (read or write). The address of the
PCA9506 is shown in
addresses and need to be connected to V
pull-up resistors are incorporated on A2, A1, and A0.
The last bit of the first byte defines the operation to be performed. When set to logic 1 a
read is selected, while a logic 0 selects a write operation.
Following the successful acknowledgement of the slave address + R/W bit, the bus master
will send a byte to the PCA9506, which will be stored in the Command register.
Symbol
OE
INT
RESET
Fig 5. PCA9506 address
Fig 6. Command register
HVQFN package die supply ground is connected to both V
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
printed-circuit board in the thermal pad region.
Figure 1 “Block diagram of PCA9506”
IO4_7”.
Pin description
Pin
TSSOP56
30
55
56
Rev. 01 — 14 February 2006
Figure
AI
Auto-Increment
1
…continued
0
5. Slave address pins A2, A1, and A0 choose 1 of 8 slave
0
D5
0
HVQFN56
23
48
49
1
D4
fixed
0
register number
slave address
0
D3
40-bit I
0
DD
0
D2
0
(1) or V
programmable
A2
002aab495
2
D1
and
0
C-bus I/O port with RESET, OE, and INT
A1
D0
Type
I
O
I
0
SS
Figure 2 “Simplified schematic of
SS
002aab494
pins and exposed center pad. V
A0 R/W
default at power-up
or after RESET
(0). To conserve power, no internal
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Description
active LOW output enable input
active LOW interrupt output
active LOW reset input
PCA9506
SS
pins must
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