AMC7834 Datasheet, PDF (47/93 Pages) Texas Instruments – AMC7834 12-Bit Integrated Power-Amplifier Monitor and Control System with Temperature, Current and Voltage Supervision Capabilities

www.ti.com
AMC7834
SLAS972B – NOVEMBER 2014 – REVISED MARCH 2016
7.4 Device Functional Modes
The AMC7834 four high-side current-sense amplifiers and bipolar DACs operate in one of the following modes
as selected by the LOOP-EN bit in register 0x10:
• Open-Loop Mode
• Closed-Loop Mode
7.4.1 Open-Loop Mode
The AMC7834 is set by default in open-loop mode. In open-loop mode, the current-sense amplifiers and bipolar
DACs operate independently.
The AMC7834 four current sensors can operate with differential voltages up to 200 mV and accept common-
mode voltages from 4 V to 60 V. The current-sense amplifier outputs are converted by the device ADC and the
results are stored in straight binary format in the CS-Data registers (address 0x29 through 0x2B) to be accessed
by a digital control device for further processing.
The AMC7834 four bipolar DACs are configured as DAC pairs (DAC1-DAC2 and DAC3-DAC4). The output
range for each bipolar DAC pair can be configured through the DAC Range register to one of the following: 0 to 5
V, -5 to 0V, or -4 to 1 V. The POR and clamp value for each DAC pair is set by the pins VCLAMP1 (for the
DAC1-DAC2 pair) and VCLAMP2 (for the DAC3-DAC4 pair) to any voltage between AV_SS and 0 V. The full-scale
output range of the bipolar DACs is limited by the power supplies, AV_DD and AV_SS. In open-loop mode the DAC
output voltage is set by by a digital controller by writing the corresponding code in straight binary format to the
DAC data registers (address 0x30 through 0x33).
Table 6 lists the typical register configurations for open-loop mode.
Table 6. Open-Loop Mode Register Configuration
REGISTER SETTING
LOOP-EN
CS-FILTER[2:0]
ADCINTn
LOOPn-SET[3:0]
DACn-SYNC
ADCINT/CS-SELECT
DACnnLOOP-ALARMEN
DACn-HIGH-ALARM
ADCINTn-DATA[11:0]
CSn-DATA[11:0]
DACn-DATA[11:0]
CLOSEDLOOPn[11:0]
DACnn-UP-THRES[11:0]
REGISTER ADDRESS
0x10
0x10
0x12
0x14
0x15
0x1B
0x1B
0x1E
0x20 to 0x23
0x28 to 0x2B
0x30 to 0x33
0x38 to 0x3B
0x4E to 0x4F
COMMENT
Set to 0
Configurable
Set to 0
Unused
Configurable
Set to 1
Set to 0
Unused
Unused
Readable
Configurable
Unused
Unused
Copyright © 2014–2016, Texas Instruments Incorporated
Product Folder Links: AMC7834
Submit Documentation Feedback
47