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NXP Semiconductors
PCU9955
16-channel UFm I 2 C-bus 57 mA constant current LED driver
Example 1: If R ext = 1 k ? , I O _LED_LSB = 225 ? A, I O _LED_MAX = 57.375 mA.
So each channel can be programmed with its individual IREFx in 256 steps and in 225 ? A
increments to a maximum output current of 57.375 mA independently.
Example 2: If R ext = 2 k ? , I O _LED_LSB = 112.5 ? A, I O _LED_MAX = 26.687 mA.
So each channel can be programmed with its individual IREFx in 256 steps and in
112.5 ? A increments to a maximum output channel of 28.687 mA independently.
80
I O(LEDn)
(mA)
60
40
20
0
IREFx = 255
002aag288
1
2
3
4
5
6
7
8
9
10
R ext (kΩ)
I O(LEDn) (mA) = IREFx ? (0.9 / 4) / R ext (k ? )
maximum I O(LEDn) (mA) = 255 ? (0.9 / 4) / R ext (k ? )
Remark: Default IREFx at power-up = 0.
Fig 5.
I O(target) versus R ext
57.375 (1)
I O(target)
(mA)
40
30
20
10
0
002aaf396
0
31
63
95
127
159
191
223
255
IREFx[7:0] value
(1) Assuming R ext = 1 k ? .
Fig 6.
I O(target) versus IREFx value
PCU9955
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 2 October 2012
? NXP B.V. 2012. All rights reserved.
18 of 39
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