tps65185: tps65185 troubleshooting

Part Number: tps65185

hello,

we are working on Eink display and we used PMIC TPS65185 for that please see below is our schematic.

we used imx7 processor for communication with eink.

we have facing some issue on that PMIC below is our issue on TPS65185.

- for powerup all rail and IIC communication we high WAKEUP pin and low POWERUP pin. it then we configure all register POWERUP, VNEG, VEE, VPOS, VDDH, is enabled using resistor. then we take PMIC into active mode.

- but internal booster DCDC1 and DCDC2 is in regulation. and VNEG and VEE is also in regulation but VPOS and VDDH is not in regulation.

- we check int2 register and its get error 10h so VPOS_UV interput come from IC because of VPOS is only generate 2.5V .

- for that we check internal register VCOM_EN which is high.

please see below is our schematic.

please explain why VPOS and VDDH is not in regulation.

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