AMC7891_14 Datasheet, PDF (20/42 Pages) Texas Instruments – Analog Monitor and Control Circuit with 10-Bit, Multi-Channel ADC and Four DACs, Temperature Sensor, and 12 GPIOs

AMC7891
SBAS518A – AUGUST 2011 – REVISED DECEMBER 2011
www.ti.com
Register name: AMC_config – Address: 0x36, Default: 0x2000 (READ/WRITE)
Register
Name
Address Bit
Name
Function
AMC_config 0x36 15:4
Reserved
Reserved for factory use.
13
adc_mode
When set to ‘1’, the ADC is in Auto-mode conversion.
When cleared to ‘0’, the ADC is in Direct-mode conversion.
12
adc_trig
When set to ‘1’ triggers a new ADC conversion cycle. The bit is
cleared to ‘0’ automatically after the ADC conversion cycle starts.
11
dac_load
When set to ‘1’ data is loaded into the DAC output channels set to
synchronous mode in register dac_sync, 0x3A.
The AMC7891 updates the DAC output only if the corresponding
dacn_data register has been accessed since the last dac_load
trigger. Any DAC channels that have not been accessed are not
reloaded again.
10
Reserved
Reserved for factory use.
9:8
adc_rate(1:0) Sets the primary ADC conversion rate
adc_rate(1:0)
Conversion time (kSPS)
00
500
01
250
10
125
11
62.5
7
adc_ready
ADC data available indicator in Direct-mode conversion. Always
cleared to ‘0’ in Auto-mode conversion.
A ‘1’ read from this bit indicates the ADC conversion cycle is
complete and new data is available.
A ‘0’ read from this bit indicates the ADC conversion cycle is in
progress or the ADC is in Auto-mode.
To clear this bit one of the following events has to occur:
1. Reading the adcn_data registers.
2. Starting a new ADC conversion cycle.
6:0
Reserved
Reserved for factory use.
Register name: ADC_enable – Address: 0x37, Default: 0x0000 (READ/WRITE)
Register
Name
Address
Bit Name
Function
ADC_enable
0x37
15 Reserved
Reserved for factory use.
14 adc0_en
13 adc1_en
When set to ‘1’ the corresponding analog input channel AIN_n
(n = 0, 1, …, 7) is accessed during an ADC conversion cycle.
11 adc2_en
10 adc3_en
When cleared to ‘0’ the corresponding input channel AIN_n
(n = 0, 1, …, 7) is ignored during an ADC conversion cycle.
8
adc4_en
7
adc5_en
6
adc6_en
5
adc7_en
12,9 Reserved
Reserved for factory use. Must be set to 0 for proper device
operation.
4:0 Reserved
Reserved for factory use.
Default
Value
All zeros
1
0
0
0
00
0
All zeros
Default
Value
All zeros
0
0
0
0
0
0
0
0
All zeros
All zeros
20
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