MAX1455 Datasheet, PDF (8/25 Pages) Maxim Integrated Products – Low-Cost Automotive Sensor Signal Conditioner

Low-Cost Automotive Sensor Signal
Conditioner
SENSOR
4
BDR
3 _INP
7
V_DD1
11
V_DD2
OUT 2
MAX1455
5 _INM
+5V V_DD
OUT
V_SS
6
Figure 2. Basic Ratiometric Output Configuration
0.1µF 0.1µF
GND
SENSOR
4
BDR
5 _INM
7
V_DD1
V_DD2 ¹¹
OUT 2
MAX1455
3 _INP
IN ¹
MAX1615
SHDN ⁵
3 _OUT
GND
5/3 ⁴
1kΩ
2
VPWR
+5.5V TO +28V
OUT
V_SS
6
Figure 3. Basic Nonratiometric Output Configuration
0.47µF 0.1µF
0.1µF _0.1µF
GND
• Registers ODAC and FSODAC are refreshed from
the temperature indexed EEPROM locations.
Normal Operation, Continuous Refresh:
• The MAX1455 has been calibrated, the Secure-
Lock byte has been set (CL[7:0] = FFhex), and
UNLOCK is low.
• Power is applied to the device.
• The POR functions have been completed.
• The temperature index timer reaches a 1ms time
period.
• Registers CONFIG, OTCDAC, and FSOTCDAC are
refreshed from EEPROM.
• Registers ODAC and FSODAC are refreshed from
the temperature indexed EEPROM locations.
Calibration Operation, Registers Updated by Serial
Communications:
• The MAX1455 has not had the Secure-Lock byte set
(CL[7:0] = 00hex) or UNLOCK is high.
• Power is applied to the device.
• The POR functions have been completed.
• The registers can then be loaded from the serial
digital interface by use of serial commands. See the
section on serial I/O and commands.
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