Do I need my LDO?

[Jason]

I'm using softdevice s140. 

My power comes from a CR2032 coin cell.

My board has a 1.8V LDO (Toshiba TCR3UM) because my temperature sensor is calibrated for 1.8V (TMP112B). I would like to know if I can get rid of the LDO and use the internal LDO instead. I am not sure if this is possible with my module. 

I'm using an InsightSIP ISP1807 module which looks like this.

The datasheet is here (https://www.insightsip.com/fichiers_insightsip/pdf/ble/ISP1807/isp_ble_DS1807.pdf)

Can you offer some advice on whether this is possible? 

[ketiljo]

Normally, you could connect the battery to VDDH, configure REG0 to 1.8 V and power the temp sensor from VDD. See high voltage mode athttps://infocenter.nordicsemi.com/topic/ps_nrf52840/power.html

But as the module seems to have VDDH connected to VDD internally, this functionality is disabled and you must use an external LDO.