MAX1455 Datasheet, PDF (20/25 Pages) Maxim Integrated Products – Low-Cost Automotive Sensor Signal Conditioner

Low-Cost Automotive Sensor Signal
Conditioner
Table 14. ATIM Definition
ATIM[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
DURATION OF ANALOG SIGNAL SPECIFIED IN BYTE TIMES (8-BIT TIME)
2⁰ + 1 = 2 byte times, i.e., (2 ✕ 8) / baud rate
2¹ + 1 = 3 byte times
2² + 1 = 5 byte times
2³ + 1 = 9 byte times
2⁴ + 1 = 17 byte times
2⁵ + 1 = 33 byte times
2⁶ + 1 = 65 byte times
2⁷ + 1 = 129 byte times
2⁸ + 1 = 257 byte times
2⁹ + 1 = 513 byte times
2¹⁰ + 1 = 1025 byte times
2¹¹ + 1 = 2049 byte times
2¹² + 1 = 4097 byte times
2¹³ + 1 = 8193 byte times
2¹⁴ + 1 = 16,385 byte times
In this mode, OUT is continuous; however, DIO accepts commands after 32,769 byte times. Do not parallel
connect DIO to OUT.
Table 15. ICRA Decode
ICRA[3:0]
0000
0001
0010
0011
0100
0101
0110 to
1111
NAME
CONFIG
ODAC
OTCDAC
FSODAC
FS O TC D AC
DESCRIPTION
Configuration register
Offset DAC register
Offset temperature coefficient DAC register
Full-scale output DAC register
Full-scale output temperature coefficient DAC register
Reserved. Do not write to this location (EEPROM test).
Reserved. Do not write to this location.
Sensor Compensation Overview
Compensation requires an examination of the sensor
performance over the operating pressure and tempera-
ture range. Use a minimum of two test pressures (e.g.,
zero and full span) and two temperatures. More test
pressures and temperatures result in greater accuracy.
A typical compensation procedure can be summarized
as follows:
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