ZHCSH90A January 2015 – December 2017 VSP5324-Q1
PRODUCTION DATA.
In this mode, an external reference voltage (VREFIN) can be applied to the VCM pin. UseEquation 2 to calculate the relationship between the ADC full-scale input voltage and VREFIN.
To enable this mode, set the register bits as listed in Table 5. This action changes the function of the VCM pin to an external reference input pin. The voltage applied on VCM must be 1.5 V ±50 mV.
FUNCTION | EN_HIGH_ADDRS | EN_EXT_REF | EXT_REF_VCM |
---|---|---|---|
External reference using the REFT and REFB pins | 1 | 1 | 00 |
External reference using the VCM pin | 1 | 1 | 11 |