EVM Software
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20
SNVU546C – October 2017 – Revised May 2018
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Using the LED171596AEVM Evaluation Module
Figure 35. SW Latch and Auto Latch Selection
3.12.9
Register Direct Access
The Direct Access provides another way to access to the registers. To read a register put the register
number into “Reg(hex)” text box and click the ‘Read’ button. To write the specific value into a register put
the register number and the data into “Reg(hex)” and “Data(hex)” text boxes respectively, and then click
‘Write’ button. The buttons from ‘00’ to ‘15’ provides bit data writing. Red color means bit data ‘1b’, and
gray color bit data ‘0b’. When the bit button is clicked, the bit data is reversed and register data is written
immediately.
Figure 36. Register Direct Access
3.12.10 ISET Control
The maximum current reference of the LED driver (constant-current sink) can be set using ISET. The EVM
GUI provides 10 mA, 12.5 mA, 20 mA, 30 mA, 40 mA, 50 mA, and 60 mA. Disable the LED171596A
backlight before changing the ISET jumper setting or the ISET value.
Figure 37. ISET
3.12.11 Enable Backlight Control
The bit 0 of register 0x00 can be controlled using “Enable Backlight” check box:
•
Unchecked - LED driving disabled. Device stays in STANDBY.
•
Checked - LED driving enabled.
Figure 38. Enable Bit Control
3.12.12 LED Driver Control
the LED driver group box provides information and control of LED_DRIVER_CONTROL Register (0x21).
