MAX1455 Datasheet, PDF (11/25 Pages) Maxim Integrated Products – Low-Cost Automotive Sensor Signal Conditioner

Low-Cost Automotive Sensor Signal
Conditioner
Table 2. EEPROM ODAC and FSODAC Lookup Table Memory Map
TEMP-INDEX[7:0]
EEPROM ADDRESS ODAC
LOW BYTE AND HIGH BYTE
EEPROM ADDRESS FSODAC
LOW BYTE AND HIGH BYTE
00hex
to
7Fhex
000hex and 001hex
to
0FEhex and 0FFhex
200hex and 201hex
to
2FEhex and 2FFhex
80hex
to
AFhex
100hex and 101hex
to
15Ehex and 15Fhex
1A0hex and 1A1hex
to
1FEhex and 1FFhex
Table 3. Registers
REGISTER
CONFIG
ODAC
OTCDAC
FSODAC
FSOTCDAC
DESCRIPTION
Configuration register
Offset DAC register
Offset temperature coefficient DAC register
Full-span output DAC register
Full-span output temperature coefficient DAC register
Table 4. Temp-Index Typical Values
TEMPERATURE
(°C)
TEMP-INDEX[7:0]
DECIMAL
HEXADECIMAL
-40
20
14
+25
65
41
+85
106
6A
+125
134
86
Reinitialization Sequence
The MAX1455 provides for reestablishing, or relearning,
the baud rate. The reinitialization sequence is a 1-byte
transmission of FFhex, as follows:
11111011111111111111
When a serial reinitialization sequence is received, the
receive logic resets itself to its power-up state and
waits for the initialization sequence. The initialization
sequence must follow the reinitialization sequence in
order to reestablish the baud rate.
WEAK PULLUP
REQUIRED
WEAK PULLUP
REQUIRED
DATA _{1 1 1 1 1 0 1 0 0 1 1 0 1} 0 _{11 1 1 1 1 1 1 1 1} 0 0 0 0 0 ₁ 0 0 0 _{1 1 1 1 1 1 1 1 1} 0 _{X X X X}
DIO
RECEIVE
TRANSMIT
HIGH-Z
RECEIVE
HOST
TRANSMIT
Figure 4. DIO Output Data Format
HIGH-Z
RECEIVE
HIGH-Z
TRANSMIT
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