Linear Technology LTC6804-1 - Page 50

LTC6804-1/LTC6804-2
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operaTion
Table 35. Command Bit Descriptions
NAME DESCRIPTION VALUES
MD[1:0] ADC Mode
MD ADCOPT(CFGR0[0]) = 0 ADCOPT (CFGR0[0]) = 1
01 27kHz Mode (Fast) 14kHz Mode
10 7kHz Mode (Normal) 3kHz Mode
11 26Hz Mode (Filtered) 2kHz Mode
DCP Discharge Permitted
DCP
0 Discharge Not Permitted
1 Discharge Permitted
CH[2:0] Cell Selection for ADC Conversion
Total Conversion Time in the 6 ADC Modes
CH 27kHz 14kHz 7kHz 3kHz 2kHz 26Hz
000 All Cells 1.1ms 1.3ms 2.3ms 3.0ms 4.4ms 201ms
001 Cell 1 and Cell 7
201µs 230µs 405µs 501µs 754µs 34ms
010 Cell 2 and Cell 8
011 Cell 3 and Cell 9
100 Cell 4 and Cell 10
101 Cell 5 and Cell 11
110 Cell 6 and Cell 12
PUP
Pull-Up/Pull-Down Current for
Open-Wire Conversions
PUP
0 Pull-Down Current
1 Pull-Up Current
ST[1:0] Self-Test Mode Selection
Self-Test Conversion Result
ST 27kHz 14kHz 7kHz 3kHz 2kHz 26Hz
01 Self Test 1 0x9565 0x9553 0x9555 0x9555 0x9555 0x9555
10 Self test 2 0x6A9A 0x6AAC 0x6AAA 0x6AAA 0x6AAA 0x6AAA
CHG[2:0] GPIO Selection for ADC Conversion
Total Conversion Time in the 6 ADC Modes
CHG 27kHz 14kHz 7kHz 3kHz 2kHz 26Hz
000 GPIO 1-5, 2nd Ref 1.1ms 1.3ms 2.3ms 3.0ms 4.4ms 201ms
001 GPIO 1
201µs 230µs 405µs 501µs 754µs 34ms
010 GPIO 2
011 GPIO 3
100 GPIO 4
101 GPIO 5
110 2nd Reference
CHST[2:0]* Status Group Selection
Total Conversion Time in the 6 ADC Modes
CHST 27kHz 14kHz 7kHz 3kHz 2kHz 26Hz
000 SOC, ITMP, VA, VD 748µs 865µs 1.6ms 2.0ms 3.0ms 134ms
001 SOC
201µs 230µs 405µs 501µs 754µs 34ms
010 ITMP
011 VA
100 VD**
*Note: Valid options for CHST in ADSTAT command are 0-4. If CHST is set to 5/6 in ADSTAT command, the LTC6804 treats it like ADAX command with
CHG = 5/6.
**The use of the ADSTAT command with CHST = 100 is not recommended unless special care is taken. See the Data Acquisition System Diagnostics
section for more details.