Datasheet

MAX1454
Precision Sensor Signal Conditioner
with Overvoltage Protection
5Maxim Integrated
ELECTRICAL CHARACTERISTICS (continued)
(V
DDX
= 5V, V
GND
= 0V, T
A
= +25NC, unless otherwise noted.) (Note 2)
Note 2:
All units are production tested at T
A
= +25NC and +125NC. Specifications over temperature are guaranteed by design.
Note 3: Excludes sensor or load current. Analog mode with voltage excitation on BDR pin, FSODAC = 0x8000.
Note 4: Specification is guaranteed by design.
Note 5: All electronics temperature errors are compensated together with sensor errors.
Note 6: The sensor and the device must be at the same temperature during calibration and use.
Note 7: This is the maximum allowable sensor offset.
Note 8: This is the sensor’s sensitivity normalized to its drive voltage, assuming a desired full-span output of V
DDX
- 1V and a
nominal bridge voltage of V
DDX
/2.
Note 9:
Bit weight is ratiometric to V
DDX
.
Note 10: Programming of the flash memory at room temperature is recommended.
Note 11: No commands can be executed until the erase operation has completed. During erase operations, all commands sent to
the device are ignored.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Current (Note 4) 8 mA
Program/Erase Current (Note 4) 7 mA
TEMPERATURE-TO-DIGITAL CONVERTER
Temperature ADC Resolution 8 Bits
Offset
Q3
LSB
Gain 1.5
NC/Bit
Nonlinearity
Q0.5
LSB
Lowest Digital Output 0x00 hex
Highest Digital Output 0xAF hex
DIGITAL INPUT (OUT/DIO)
Input Low Voltage V
IL
0 V
DDX
/3 V
Input High Voltage V
IH
V
DDX
x
2/3
V
DDX
V
OVERVOLTAGE PROTECTION
Overvoltage-Protection
Threshold
5.53 5.75 6.0 V
FAULT DETECTION
IN+/IN- Low Comparator
Threshold
0.2 x
V
BDR
V
IN+/IN- High Comparator
Threshold
0.8 x
V
BDR
V
Detection-Threshold Accuracy
Q25
mV
Comparator Hysteresis 20 mV
Output Clip Level During Fault
Conditions
I
OUT
= 1mA sinking 150 250 mV