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PDF MAX1455 Data sheet ( Hoja de datos )

Número de pieza MAX1455
Descripción Low-Cost Automotive Sensor Signal Conditioner
Fabricantes Maxim Integrated Products 
Logotipo Maxim Integrated Products Logotipo



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No Preview Available ! MAX1455 Hoja de datos, Descripción, Manual

19-2088; Rev 1; 10/01
www.DataShEeVeAAt4LVUUAA.ILcTAoIOBmNLEKIT
Low-Cost Automotive Sensor Signal
Conditioner
General Description
The MAX1455 is a highly integrated automotive analog-
sensor signal processor for resistive element sensors.
The MAX1455 provides amplification, calibration, and
temperature compensation that enable an overall per-
formance approaching the inherent repeatability of the
sensor. The fully analog signal path introduces no
quantization noise in the output signal while enabling
digitally controlled trimming with integrated 16-bit digi-
tal-to-analog converters (DACs). Offset and span are
also calibrated using 16-bit DACs, allowing sensor
products to be truly interchangeable.
The MAX1455 architecture includes a programmable
sensor excitation, a 16-step programmable-gain ampli-
fier (PGA), a 768-byte (6144 bits) internal EEPROM,
four 16-bit DACs, an uncommitted op amp, and an on-
chip temperature sensor. In addition to offset and span
compensation, the MAX1455 provides a unique tem-
perature compensation strategy that was developed to
provide a remarkable degree of flexibility while minimiz-
ing testing costs.
The MAX1455 is available in die form, 16-pin SSOP and
TSSOP packages.
Customization
Maxim can customize the MAX1455 for high-volume
dedicated applications. Using our dedicated cell library
of more than 2000 sensor-specific function blocks,
Maxim can quickly provide a modified MAX1455 solu-
tion. Contact Maxim for further information.
Applications
Pressure Sensors and Transducers
Piezoresistive Silicon Sensors
Strain Gauges
Resistive Element Sensors
Accelerometers
Humidity Sensors
MR and GMR Sensors
Ratiometric Voltage Output
Programmable Output Clip Limits
Outputs
A detailed Functional Diagram appears at end of data sheet.
Secure-Lock is a trademark of Maxim Integrated Products, Inc.
Features
o Provides Amplification, Calibration, and
Temperature Compensation
o Selectable Output Clipping Limits
o Accommodates Sensor Output Sensitivities
from 5mV/V to 40mV/V
o Single-Pin Digital Programming
o No External Trim Components Required
o 16-Bit Offset and Span Calibration Resolution
o Fully Analog Signal Path
o PRT Bridge Can Be Used for Temperature-
Correction Input
o On-Chip Lookup Table Supports Multipoint
Calibration Temperature Correction
o Fast 3.2kHz Frequency Response
o On-Chip Uncommitted Op Amp
o Secure-Lock™ Prevents Data Corruption
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX1455EUE* -40°C to +85°C
16 TSSOP
MAX1455AUE* -40°C to +125°C 16 TSSOP
MAX1455EAE -40°C to +85°C
16 SSOP
MAX1455AAE -40°C to +125°C 16 SSOP
MAX1455C/D -40°C to +85°C
Dice**
*Future product—contact factory for availability.
**Dice are tested at TA = +25°C, DC parameters only.
TOP VIEW
Pin Configuration
TEST1 1
OUT 2
INP 3
BDR 4
INM 5
VSS 6
VDD1 7
AMP+ 8
MAX1455
16 TEST2
15 TEST3
14 TEST4
13 DIO
12 UNLOCK
11 VDD2
10 AMP-
9 AMPOUT
SSOP/TSSOP
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

1 page




MAX1455 pdf
www.DataSheet4U.com
Low-Cost Automotive Sensor Signal
Conditioner
PIN
1, 15, 16
2
3
4
5
6
7
8
9
10
11
12
13
14
Pin Description
NAME
TEST1,
TEST3,
TEST2
OUT
INP
BDR
INM
VSS
VDD1
AMP+
AMPOUT
AMP-
VDD2
UNLOCK
DIO
TEST4
FUNCTION
Test Pins. Connect to VSS or leave unconnected.
Analog Output. Internal voltage nodes can be accessed in digital mode. OUT can be parallel
connected to DIO. Bypass OUT to ground with a 0.1µF capacitor to reduce output noise.
Positive Input. Can be swapped to INM by the Configuration register.
Bridge Drive Output
Negative Input. Can be swapped to INP by the Configuration register.
Negative Supply Voltage
Positive Supply Voltage 1. Connect a 0.1µF capacitor from VDD to VSS.
Auxiliary Op Amp Positive Input
Auxiliary Op Amp Output
Auxiliary Op Amp Negative Input
Positive Supply Voltage 2. Connect a 0.47µF capacitor from VDD2 to VSS. Connect VDD2 to VDD1 or
for improved noise performance, connect a 1kresistor to VDD1.
Secure-Lock Disable. There is a 150µA pulldown to VSS. Connect to VDD to disable Secure-Lock
and enable serial communication.
Digital Input Output. Single-pin serial communication port. There are no internal pullups on DIO.
Connect pullup resistor from DIO to VDD when in digital mode.
Test Pin. Do not connect.
Detailed Description
The MAX1455 provides amplification, calibration, and
temperature compensation to enable an overall perfor-
mance approaching the inherent repeatability of the
sensor. The fully analog signal path introduces no
quantization noise in the output signal while enabling
digitally controlled trimming with the integrated 16-bit
DACs. The MAX1455 includes four selectable high/low
clipping limits set in discrete 50mV steps from
0.1V/4.9V to 0.25V/4.75V. Offset and span can be cali-
brated to within ±0.02% of span.
The MAX1455 architecture includes a programmable
sensor excitation, a 16-step PGA, a 768-byte (6144 bits)
internal EEPROM, four 16-bit DACs, an uncommitted op
amp, and an on-chip temperature sensor. The MAX1455
also provides a unique temperature compensation strat-
egy that was developed to provide a remarkable degree
of flexibility while minimizing testing costs.
The customer can select from 1 to 114 temperature
points to compensate their sensor. This allows the lati-
tude to compensate a sensor with a simple first-order
linear correction or match an unusual temperature
curve. Programming up to 114 independent 16-bit
EEPROM locations corrects performance in 1.5°C tem-
perature increments over a range of -40°C to +125°C.
For sensors that exhibit a characteristic temperature
performance, a select number of calibration points can
be used with a number of preset values that define the
temperature curve. The sensor and the MAX1455
should be at the same temperature during calibration
and use. This allows the electronics and sensor errors
to be compensated together and optimizes perfor-
mance. For applications where the sensor and elec-
tronics are at different temperatures, the MAX1455 can
use the sensor bridge as an input to correct for temper-
ature errors.
The single pin, serial DIO communication architecture
and the ability to timeshare its activity with the sensors
output signal enables output sensing and calibration
programming on a single line by parallel connecting
OUT and DIO. The MAX1455 provides a Secure-Lock
feature that allows the customer to prevent modification
of sensor coefficients and the 52-byte user-definable
EEPROM data after the sensor has been calibrated.
The Secure-Lock feature also provides a hardware
override to enable factory rework and recalibration by
assertion of logic high on the UNLOCK pin.
_______________________________________________________________________________________ 5

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MAX1455 arduino
www.DataSheet4U.com
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
______________________________________________________________________________________ 11

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