Read Panasonic KX-NT400RU Service Manual online
8
KX-NT400RU
4.2.4.
Backlight Circuit
IC120 is LED driver for LCD backlight and generate V_BK(approx. 22V) from +12V.
IC101 controlls IC120 with BL_PWMPOW, BL_RSTB, BL_PWMOUT.
BL_PWMPOW and BL_RSTB must be "high" when Backlight turns on.
BL_PWMOUT is 200Hz PWM signal and it's duty controlls Backlight brightness.
IC101 controlls IC120 with BL_PWMPOW, BL_RSTB, BL_PWMOUT.
BL_PWMPOW and BL_RSTB must be "high" when Backlight turns on.
BL_PWMOUT is 200Hz PWM signal and it's duty controlls Backlight brightness.
4.2.5.
TouchPanel I/F Circuit
TouchPanel and IC111 are connected with 4-wire analog signals.
IC101 and IC111 are connected by synchronous serial bus.
When pendown detected, IC111 informes IC101 by raising TP_PENIRQ signal to "high".
Then, IC101 takes coordinate information of pen position by controlling IC111.
IC101 and IC111 are connected by synchronous serial bus.
When pendown detected, IC111 informes IC101 by raising TP_PENIRQ signal to "high".
Then, IC101 takes coordinate information of pen position by controlling IC111.
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