Datasheet

AD7747
Rev. 0 | Page 18 of 28
CONFIGURATION REGISTER
Address Pointer 0x0A, Default Value 0xA0
Converter update rate and mode of operation setup.
Table 17. Configuration Register Bit Map
Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Mnemonic VTFS1 VTFS0 CAPFS2 CAPFS1 CAPFS0 MD2 MD1 MD0
Default 0 0 0 0 0 0 0 0
Table 18.
Bit Mnemonic Description
Voltage/temperature channel digital filter setup—conversion time/update rate setup.
VTCHOP = 1
VTFS1 VTFS0 Conversion Time (ms) Update Rate (Hz) −3 dB Frequency (Hz)
0 0 20.1 49.8 26.4
0 1 32.1 31.2 15.9
1 0 62.1 16.1 8.0
7
6
VTFS1
VTFS0
1 1 122.1 8.2 4.0
Capacitive channel digital filter setup—conversion time/update rate setup.
CAPFS2 CAPFS1 CAPFS0 Conversion Time (ms) Update Rate −3 dB Frequency (Hz)
0 0 0 22.0 45.5 43.6
0 0 1 23.9 41.9 39.5
0 1 0 40.0 25.0 21.8
0 1 1 76.0 13.2 10.9
1 0 0 124.0 8.1 6.9
1 0 1 154.0 6.5 5.3
1 1 0 184.0 5.5 4.4
5
4
3
CAPFS2
CAPFS1
CAPFS0
1 1 1 219.3 4.6 4.0
Converter mode of operation setup.
MD2 MD1 MD0 Mode
0 0 0 Idle
0 0 1 Continuous conversion
0 1 0 Single conversion
0 1 1 Power-down
1 0 0 –
1 0 1 Capacitance system offset calibration
1 1 0 Capacitance or voltage system gain calibration
2
1
0
MD2
MD1
MD0
1 1 1 –