SN8F5708 datasheet(118/204 Pages) SONIX

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SN8F5708 Series

OPA

Datasheet Rev. 2.4

118

18 OPA

The microcontroller builds in two operational amplifiers (OP0 and OP1). The OP-Amp power range

is VSS – VDD. OP-Amp input signal and output voltage are within the voltage range. The OP-Amp

output pin is programmable to connect with ADC input channel for voltage measurement.

Vdd

Vss

Vout

V+

V-

OPnN Pin

OPnEN

OPnP Pin

OPnO Pin

OPnEN

To ADC channel

OP0=>(CHS[4:0]= 11000b)

OP1=>(CHS[4:0]= 11001b)

GPIO

OPnEN

GPIO

18.1

Configurations of Operation

The OP-AMP pins are shared with GPIO controlled by OP0EN/OP1EN bit. When OPEN=0, OP AMP

pins are GPIO mode. When OPEN=1, GPIO pins switch to OP-AMP and isolate GPIO path. OP-AMP

pins selection table is as following.

OP-AMP N0.

OPnEN

OP Positive Pin

OP Negative Pin

OP Output Pin

OP0

OP0EN = 0

All pins are GPIO mode.

OP0EN = 1

OP0P (Vin+)

OP0N (Vin-)

OP0O (Vout)

OP1

OP1EN = 0

All pins are GPIO mode.

OP1EN = 1

OP0P (Vin+)

OP0N (Vin-)

OP0O (Vout)

OP0/OP1 output pins are also connected to ADC internal AIN12 and AIN13 channel => CHS[4:0].

See detailed description of ADC section.

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