MAX1136_09 Datasheet, PDF (14/22 Pages) Maxim Integrated Products – 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial 10-Bit ADCs

2.7V to 3.6V and 4.5V to 5.5V, Low-Power,
4-/12-Channel, 2-Wire Serial 10-Bit ADCs
Table 2. Configuration Byte Format
BIT 7
(MSB)
REG
BIT 6
SCAN1
BIT 5
SCAN0
BIT 4
CS3
BIT 3
CS2
BIT 2
CS1
BIT 1
CS0
BIT 0
(LSB)
SGL/DIF
BIT
NAME
DESCRIPTION
7
REG
Register bit 1= setup byte (see Table 1), 0 = configuration byte
6
SCAN1
Scan select bits. Two bits select the scanning configuration
5
SCAN0
(Table 5). Defaulted to 00 at power-up.
4
CS3
3
CS2
Channel select bits. Four bits select which analog input channels are to be used for conversion
(Tables 3 and 4). Defaulted to 0000 at power-up. For MAX1136/MAX1137, CS3 and CS2 are
2
CS1
internally set to 0.
1
CS0
0
SGL/DIF
1 = single-ended, 0 = differential (Tables 3 and 4). Defaulted to 1 at power-up. See the Single-
Ended/Differential Input section.
Table 3. Channel Selection in Single-Ended Mode (SGL/DIF = 1)
CS3¹ CS2¹ CS1 CS0 AIN0 AIN1 AIN2 AIN3² AIN4 AIN5 AIN6 AIN7 AIN8 AIN9 AIN10 AIN11² GND
0
0
0
0
+
-
0
0
0
1
+
-
0
0
1
0
+
-
0
0
1
1
+
-
0
1
0
0
+
-
0
1
0
1
+
-
0
1
1
0
+
-
0
1
1
1
+
-
1
0
0
0
+
-
1
0
0
1
+
-
1
0
1
0
1
0
1
1
+
-
+
-
1
1
0
0
RESERVED
1
1
0
1
RESERVED
1
1
1
0
RESERVED
1
1
1
1
RESERVED
1. For MAX1136/MAX1137, CS3 and CS2 are internally set to 0.
2. When SEL1 = 1, a single-ended read of AIN3/REF (MAX1136/MAX1137) or AIN11/REF (MAX1138/MAX1139) will be ignored; scan
will stop at AIN2 or AIN10.
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