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NXP Semiconductors
PCU9955
16-channel UFm I 2 C-bus 57 mA constant current LED driver
7.3.12 PWMALL — brightness control for all LEDn outputs
When programmed, the value in this register will be used for PWM duty cycle for all the
LEDn (n = 0 to 15) outputs.
Table 15.
PWMALL - brightness control for all LEDn outputs register (address 42h)
bit description
Legend: * default value.
Address
42h
Register
PWMALL
Bit
7:0
Access
W only
Value
0000 0000*
Description
duty cycle for all LEDn outputs
Remark: Write to any of the PWM0 to PWM15 registers will overwrite the value in
corresponding PWMn register.
7.3.13 IREFALL — output current value for all LEDn outputs
The output current setting for all outputs is held in this register. When this register is
written to or updated, all LEDn outputs will be set to a current corresponding to this
register value.
Writes to IREF0 to IREF15 will overwrite the output current settings.
Table 16. IREFALL - Output gain control for all LEDn outputs (address 43h) bit description
Legend: * default value.
Bit
7:0
Symbol
IREFALL
Access
W only
Value
00h*
Description
Current gain setting for all LEDn outputs.
7.3.14 LED driver constant current outputs
In LED display applications, PCU9955 provides nearly no current variations from channel
to channel and from device to device. The maximum current skew between channels is
less than ? 6 % and less than ? 8 % between devices.
7.3.14.1
Adjusting output current
The PCU9955 scales up the reference current (I ref ) set by the external resistor (R ext ) to
sink the output current (I O ) at each output port. The maximum output current for the
outputs can be set using R ext . In addition, the constant value for current drive at each of
the outputs is independently programmable using command registers IREF0 to IREF15.
Alternatively, programming the IREFALL register allows all outputs to be set at one current
value determined by the value in IREFALL register.
Equation 4 and Equation 5 can be used to calculate the minimum and maximum constant
current values that can be programmed for the outputs for a chosen R ext .
I O _ LED _ LSB = ------------------- ? ---
R ext
I O _ LED _ MAX = ? 255 ? I O _ LED _ LSB ? = ? ------------------- ? --------- ?
For a given IREFx (x = 0 to 15) setting, I O _ LED = IREFx ? ------------------- ? --- .
R ext
900 mV 1
4
? R ext 4 ?
900 mV 255
900 mV 1
4
(4)
(5)
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.
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