MAX1361/MAX1362
Reading a Conversion (Read Cycle)
Initiate a read cycle to start a conversion sequence and
to obtain conversion results. See the Scan Modes
section for details on the channel-scan sequence. Read
cycles begin with the bus master issuing a START
condition followed by 7 address bits and a read bit
(R/W = 1). After successfully receiving the address byte,
the MAX1361/MAX1362 (slave) issue an ACK. The master
then reads from the slave. (See Figures 10–13.)
The result is transmitted in 2 bytes. The 1st byte con-
sists of a leading 1 followed by a 2-bit binary channel
address tag, a 12/10 bit flag (0 for the MAX1361/
MAX1362), 2 bits of 1s, the first 2 bits of the data result,
and the expected ACK from the master. The 2nd byte
4-Channel, 10-Bit, System Monitor with Programmable
Trip Window and SMBus Alert Response
16 ______________________________________________________________________________________
Setup Setup byte always starts with 1.
6 REF/AIN SEL1
5 REF/AIN SEL0
When [0,0], REF/AIN3 = AIN3, REF = V
DD.
When [0,1], REF/AIN3 = REF, REF = external reference.
When [1,0], REF/AIN3 = AIN3, REF = internal reference.
When [1,1], REF/AIN3 = REF, REF = internal reference.
(Table 3)
4
INT REF Power
Down
1 = internal reference always powered up.
0 = internal reference always powered down.
(Table 3)
3 INT/EXT Clock
0 = internal clock.
1 = external clock (MAX1361/MAX1362 use the SCL clock for conversions).
2 UNI/BIP
0 = unipolar.
1 = bipolar.
Selects unipolar or bipolar conversion mode. In unipolar mode, analog signal in 0 to V
REF
range can
be converted. In differential bipolar mode, input signal can range from -V
REF
/ 2 to +V
REF
/ 2. When
single-ended mode is chosen, the SE/DIF bit of configuration byte overrides UNI/BIP, and
conversions are performed in unipolar mode.
1 Reset
1 = no action.
0 = resets INT and configuration register. Setup register and channel trip thresholds are unaffected.
0 Monitor Setup
0 = no action.
1 = extends writing up to 13 bytes (104 bits) of alarm reset mask. Scans speed selection and alarm
thresholds. See the Configuring Monitor Mode section.
Table 4. Setup-Byte Format*
*Power-on defaults: 0x82
CS1 CS0 CH0 CH1 CH2 CH3
00+
01 +
10 +
11 +
Table 5. Channel Selection in Single-
Ended Mode (SE/DIF = 1)
CS1 CS0 CH0 CH1 CH2 CH3
00+-
01-+
10 +-
11 -+
Table 6. Channel Selection in Differential
Mode (SE/DIF = 0)
SE/DIF UNI/BIP MODE
0 0 Differential inputs, unipolar
0 1 Differential inputs, bipolar
10
Single-ended inputs, unipolar
Single-ended inputs, unipolar
Table 7. SE/DIF and UNI/BIP Table
(8 Seiten)
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