AMC7834 Datasheet, PDF (33/93 Pages) Texas Instruments – AMC7834 12-Bit Integrated Power-Amplifier Monitor and Control System with Temperature, Current and Voltage Supervision Capabilities

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AMC7834
SLAS972B – NOVEMBER 2014 – REVISED MARCH 2016
The voltage slot takes 16 µs and allocates the four external inputs and four DAC monitoring internal inputs
conversions. The external inputs, if enabled, are converted first. If none of the channels in a group (external or
internal) are selected, no time is allocated for conversion of that group. However if at least one of the input
channels in a group is enabled, five interleave steps (1 ms) are allocated regardless of the total number of input
channels.
The current slot allocates the four current sensing channel conversions. The current slot is 160 µs long
independent of how many current sense channels are enabled. The current sensors are updated on each
interleave step (200 µs) when the CS-FILTER[2:0] set to 000 in register 0x10. If a longer current sense update
time is selected to improve measurement accuracy a higher number of interleave steps is allocated for the
current sense conversions.
The update time for all monitoring inputs is determined by the interleave sequence followed. Direct-mode
conversions require an additional 40 µs of update time. In order to simplify synchronization, the AMC7834
provides a data-available signal through the DAV/ADC_RDY pin. The DAV/ADC_RDY pin must first be enabled
through the DAVPIN-EN bit in register 0x11. Furthermore the DAV functionality must be selected by clearing the
DAVPIN-SEL bit in register 0x11 to '0'.
In direct-mode conversion the DAV/ADC_RDY pin goes low after the conversion sequence has been completed.
Additionally, in direct-mode conversion the data available flags in the General status register (address 0x1F) can
be used to determine when new data is available for each data-available channel group. In autonomous
conversion the DAV/ADC_RDY pin indicates when new data is available for each data-available channel group
by issuing a 20 µs pulse (active low).
In both conversion methods the data-available function identifies six channel groups:
1. Current sense inputs: CS1 through CS4
2. External analog inputs: ADC1 through ADC4
3. Internal monitoring inputs: ADCINT1 through ADCINT4
4. Internal temperature sensor: LT
5. Remote temperature sensor 1: RT1
6. Remote temperature sensor 2: RT2
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