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PCA9952 Datasheet(PDF) 21 Page - NXP Semiconductors

Part # PCA9952
Description  16-channel Fm I2C-bus 57 mA constant current LED driver
PDF  48 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCA9952 Datasheet(HTML) 21 Page - NXP Semiconductors

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All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet
Rev. 7.1 — 29 June 2015
21 of 48
NXP Semiconductors
PCA9952; PCA9955
16-channel Fm+ I2C-bus 57 mA constant current LED driver
Example 1: If Rext =1k, IO_LED_LSB = 225 A, IO_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 Rext =2k, IO_LED_LSB = 112.5 A, IO_LED_MAX = 28.687 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.
IO(LEDn) (mA) = IREFx  (0.9 / 4) / Rext (k)
maximum IO(LEDn) (mA) = 255  (0.9 / 4) / Rext (k)
Remark: Default IREFx at power-up = 0.
Fig 6.
Maximum ILED versus Rext
(1) Assuming Rext = 1 k.
Fig 7.
IO(target) versus IREFx value
Rext (kΩ)
1
10
9
48
2
002aag288
0
60
40
20
80
IO(LEDn)
(mA)
5
6
IREFx = 255
3
7
IREFx[7:0] value
0
255
191
127
63
002aaf396
20
30
10
40
57.375(1)
IO(target)
(mA)
0
31
95
159
223



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