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NXP Semiconductors
PCA9532
16-bit I 2 C-bus LED dimmer
6.2.1 Control register de?nition
Table 3.
Register summary
B3
0
0
0
0
0
0
0
0
1
1
B2
0
0
0
0
1
1
1
1
0
0
B1
0
0
1
1
0
0
1
1
0
0
B0
0
1
0
1
0
1
0
1
0
1
Symbol
INPUT0
INPUT1
PSC0
PWM0
PSC1
PWM1
LS0
LS1
LS2
LS3
Access
read only
read only
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
Description
input register 0
input register 1
frequency prescaler 0
PWM register 0
frequency prescaler 1
PWM register 1
LED0 to LED3 selector
LED4 to LED7 selector
LED8 to LED11 selector
LED12 to LED15 selector
6.3 Register descriptions
6.3.1 INPUT0 - Input register 0
The INPUT0 register re?ects the state of the device pins (inputs 0 to 7). Writes to this
register will be acknowledged but will have no effect.
Table 4.
INPUT0 - Input register 0 description
Bit
Symbol
Default
7
LED7
X
6
LED6
X
5
LED5
X
4
LED4
X
3
LED3
X
2
LED2
X
1
LED1
X
0
LED0
X
Remark: The default value ‘X’ is determined by the externally applied logic level (normally
logic 1) when used for directly driving LED with pull-up to V DD .
6.3.2 INPUT1 - Input register 1
The INPUT1 register re?ects the state of the device pins (inputs 8 to 15). Writes to this
register will be acknowledged but will have no effect.
Table 5.
INPUT1 - Input register 1 description
Bit
Symbol
Default
7
LED15
X
6
LED14
X
5
LED13
X
4
LED12
X
3
LED11
X
2
LED10
X
1
LED9
X
0
LED8
X
Remark: The default value ‘X’ is determined by the externally applied logic level (normally
logic 1) when used for directly driving LED with pull-up to V DD .
PCA9532_4
? NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 04 — 17 March 2009
6 of 29
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