PGA900 Datasheet, PDF (89/137 Pages) Texas Instruments – PGA900 Programmable Resistive Sensing Conditioner with Digital and Analog Outputs

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PGA900
SLDS209A – JANUARY 2015 – REVISED MAY 2015
7.5.2.26 DAC_LPBK_CTRL (M0 address = 0x4000053A) (DI page address = 0x2) (DI page offset = 0x3A)
Figure 86. DAC_LPBK_CTRL
7
6
5
4
3
2
1
0
EN_LB
LB_AMP_
EN
LB_
CONNECT
RW
RW
RW
0
0
0
Bit Definitions
DAC_LPBK_CTRL
Table 31. DAC_LPBK_CTRL Field Descriptions
Bit
0: LB_CONNECT
1: LB_AMP_EN
2: EN_LB
3:
4:
5:
6:
7:
1: Connects the output of the DAC to the input of the loopback amplifier
0: Disconnects the output of the DAC from the input of the loopback amplifier
1: Enables loopback amplifier
0: Disables loopback amplifier
1: Connects the output of the loopback amplifier to PGA input
0: Disconnects the output of the loopback amplifier from PGA input
7.5.2.27 OP_STAGE_CTRL (M0 address = 0x4000053B) (DI page address = 0x2) (DI page offset = 0x3B)
Figure 87. OP_STAGE_CTRL
7
6
5
4
3
2
1
0
PULLUP_EN DACCAP_EN 4_20MA_EN DAC_GAIN[2] DAC_GAIN[1] DAC_GAIN[0]
RW
RW
RW
RW
RW
RW
0
0
0
1
0
1
Bit
Definitions
Bit
0: DAC_GAIN[0]
1: DAC_GAIN[1]
2: DAC_GAIN[2]
OP_STAGE_
CTRL
3: 4_20MA_EN
4: DACCAP_EN
5: PULLUP_EN
6:
7:
Table 32. OP_STAGE_CTRL Field Descriptions
DAC_GAIN[2]
DAC_GAIN[1]
DAC_GAIN[0]
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
1: Enable 4- to 20-mA current loop (close switch S5 in DAC gain)
0: Disable 4- to 20-mA Current Loop (Open switch S5 in DAC gain)
1: Enable DACCAP capacitor (close switch S4 in DAC gain)
0: Disable DACCAP capacitor (open switch S4 in DAC gain)
1: Enable pullup at the input of DAC gain (close switch S8 in DAC gain)
0: Disable pullup at the input of DAC gain (open switch S8 in DAC gain)
Description
Voltage mode disabled
Gain = 10 V/V
Gain = 4 V/V
Reserved
Gain = 2 V/V
Reserved
Gain = 6.67 V/V
Reserved
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