ES51993
11,000 Counts ADC
3. Multi Channel Input
ES51993 provides VIN+, VIN1+, VIN2+ and Vin- pins to achieve the multi channel
input (multiplexer) feature. Because ES51993 is a single core A-to-D converter, it can
only process one pack of data per conversion period. Although it has four input pins, it
would take only one pair as input channel from the four pins. The actual input channel
is determined by the bits CH1/CH0 of STATUS Byte1 as the following table:
Input Channel
CH1 CH0 High Input
Low Input
VIN-
ch1
ch2
ch3
ch4
0
0
1
1
0
1
0
1
VIN+
VIN1+
VIN2+
VIN2+
VIN-
VIN-
VIN1+
ES51993 also configures an input channel rotation (polling) feature. Setting the ROT
bit of STATUS Byte2 to high can activate the rotation feature. In the rotation mode, the
actual input channel will be changed by ES51993 sequentially and automatically. The
rotation feature has two types, one is for three input channel rotation with the same low
input, another one is for two independent differential channel rotation. The following
table presents the configuration of the rotation type.
Rotation Type Table:
ROT
CH1,CH0
Rotation Type
0,0
0,1
1,0
1,1
-
ch1 → ch2 → ch3 → ch1 …
H
ch1 → ch4 → ch1 …
L
Not Rotating
7
06/09/20
CYRUSTEK [ Cyrustek corporation ]
