ver. 1.2

16/07/12

14

ES222(9999counts dual)

DMM Analog front end/Inrush

1.3 Function Block Diagram

ES222 includes dual ADC core which could be controlled individually. C1/C0 set the ADC

conversion rate. The both ADCs could be set in different conversion rate. ES222 is implemented by

resistor divider network to decrease external complex analog switches for DMM application. It also

includes UDP channels to implement current mode network or other special measurement mode.

The input channels could be DC signals or from output of AC-to-DC converter (AC mode is active).

It also could be switched another path to frequency counter if VAHZ control mode is active. If

AD1OFF or AD2OFF is set to high, the ADC1 or ADC2 core will enter power down mode,

respectively.

ADC1/ADC2 input channel MUX control: AD12IN/AD21IN/AD1UPIN/AD2UPIN

Set control bit = 1

Description

AD12IN

ADC1 input switched to ADC2 input channel simultaneously

AD21IN

ADC2 input switched to ADC1 input channel simultaneously

AD1UPIN

ADC1 input switched to UDPIN input channel (selected by SUDPn_1)

AD2UPIN

ADC2 input switched to UDPIN input channel (selected by SUDPn_2)