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NXP Semiconductors
PCA9551
8-bit I 2 C-bus LED driver with programmable blink rates
If the Auto-Increment (AI) ?ag is set, the three low order bits of the Control register are
automatically incremented after a read or write. This allows the user to program the
registers sequentially. The contents of these bits will rollover to ‘000’ after the last register
is accessed.
When the Auto-Increment ?ag is set (AI = 1) and a read sequence is initiated, the
sequence must start by reading a register different from ‘0' (B2 B1 B0 ≠ 000).
Only the 3 least signi?cant bits are affected by the AI ?ag. Unused bits must be
programmed with zeroes.
6.2.1 Control register de?nition
Table 3.
Register summary
B2
0
0
0
0
1
1
1
B1
0
0
1
1
0
0
1
B0
0
1
0
1
0
1
0
Symbol
INPUT
PSC0
PWM0
PSC1
PWM1
LS0
LS1
Access
read only
read/write
read/write
read/write
read/write
read/write
read/write
Description
input register
frequency prescaler 0
PWM register 0
frequency prescaler 1
PWM register 1
LED0 to LED3 selector
LED4 to LED7 selector
6.3 Register descriptions
6.3.1 INPUT - Input register
The INPUT register re?ects the state of the device pins. Writes to this register will be
acknowledged but will have no effect.
Table 4.
INPUT - Input register 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 PSC0 - Frequency Prescaler 0
PSC0 is used to program the period of the PWM output.
The period of BLINK0 = (PSC0 + 1) / 38.
Remark: Prescaler calculation is different between the PCA9551 and other PCA955x
LED blinkers. A divider ratio of 38 instead of 44 is used. This different divider ratio causes
the blinking frequency to be 13 % (1 ? 38 / 44) lower when the same 8-bit word is used.
The programmed value of Frequency Prescaler 0 must be adjusted to compensate for this
difference in applications where the PCA9551 is used in conjunction with other PCA955x
LED blinkers and the observed blinking frequencies need to be the same.
PCA9551_8
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 08 — 31 July 2008
5 of 26
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