FS9912

Rev. 3.6

27/34

modulator.

ADO is the ADC output. The maximum value is 3D09h and the minimum is C2F7h (-3D09h). FFFF

means (-0001).

The output rate of the ADC is 40Hz. When the output data are updated, the interrupt signal is sent to the

CPU. If ADIE=1, then ADIF is set to 1.

AZ=0 means that the ADC differential inputs are (INH, INL); AZ= 1 means that the ADC differential inputs

are (INL,INL). We can use this mode to measure the ADC offset.

ADCGB [1:0] will set ADC input gain as follows, 00: 2/3, 01: 1, 10: 2, 11: 2 1/3.

11.8 Analog Multiplex

Address

Name

Content

029H

NETA

SINL1

SINL0

SINH2

SINH1

SINH0

SOP1P2 SOP1P1 SOP1P0

02AH

NETB

SVRH

SVRL

ENOP

SONE

SFTA

SFT1

SFT0

OP1P: OP1 Positive Input

SOP1O

000

001

010

011

100

101

110

111

Select

AD2

AD4

AD3

AD0

AD5

AD6

AGND

AD1

FTIN: Low Pass Filter Input

SINH

000

001

010

011

100

101

110

111

Select

OP1O

VRH

VRL

OP1P

VDD

AD5

ADINL: ADC Negative Input

SINL

00

01

10

11

Select

AD7

AGND

AD4

AD1

4. ADINH: Filter Output, ADC Positive Input

SFT [1:0]

00

01

10

11

Select

FT1

FTIN

AD0

AD4

VRH: ADC Reference Voltage Positive Input

SVRH

0

1

Select

REFI

AD0

VRL: ADC Reference Voltage Negative Input

SVRL

0

1

Select

AGND

AD4

External Filter Control: SFTA=0: FTIN and FT1 open. SFTA=1: FTIN and FT1 short.

11.9 Low Noise OPAMP

Address

Name

Content

027H

PT2MR

BPE2,

BPE1

OPC1

OPC0

BPS

PMPS

02AH

NETB

SVRH

SVRL

ENOP

SONE

SFTA

SFT1

SFT0

ENOP is the OPAMP enable control signal

SONE=1, the output and negative input of OPAMP is short and OPAMP is unit gain buffer.

OPC can set OP1 input operation mode as follows, 00: +Offset, 01: -Offset, 10: 2KHz chopper frequency,

11: 1KHz Chopper frequency.

11.10 LCD Driver

030H

LCD1

SEG1 [3:0], SEG2 [3:0]

031H

LCD2

SEG3 [3:0], SEG4 [3:0]

032H

LCD3

SEG5 [3:0], SEG6 [3:0]

033H

LCD4

SEG7 [3:0], SEG8 [3:0]