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MAX13037, MAX13038
Automotive Contact Monitor and Level Shifters with LDO Regulator
Micropower Automotive Contact Monitor/Level Shifter Features LDO Regulator, WDG, and Reset
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Status
Active: In Production.
Description
The MAX13037/MAX13038 automotive contact monitor
and level shifters monitor and debounce eight remote
mechanical switches and assert an interrupt (active-low INT) if a
switch changes state. The state of each switch is sampled
through an SPI™ interface by reading the status
register. Any switch can be prohibited from asserting an
interrupt by writing to the command register. Four of the
switch inputs are intended for ground-connected
switches (IN0–IN3) and the other four inputs (IN4–IN7)
are programmable in groups of two for either ground-connected
or battery-connected switches. Two switch inputs (IN0, IN1) have direct level-shifted outputs (DO0, DO1) to be used for PWM or other timing-based signals.
Switch input thresholds are set to 50% of the voltage
applied to BATREF. The threshold hysteresis is set by
connecting an external resistor from HYST to ground.
The MAX13037/MAX13038 supply an adjustable wetting
current to each closed switch to clean mechanical
switch contacts that are exposed to adverse conditions.
The MAX13037/MAX13038 feature a low dropout (LDO)
linear regulator capable of supplying up to 150mA of
current. The MAX13037 LDO has an output voltage of
+5V, whereas the MAX13038 has an output voltage of
+3.3V. The MAX13037/MAX13038 also feature a watchdog
timer and an open-drain reset output with
adjustable timing.
The MAX13037/MAX13038 operate with a +6V to +26V
battery voltage applied to BAT. The MAX13037/MAX13038 are available in a 6mm x 6mm, 36-pin TQFN package and operate over the automotive -40°C to
+125°C temperature range.
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Data Sheet
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Key Features
- +6V to +26V Operating Voltage Range
- +42V Compatibility on BAT
- Switch Inputs Withstand Reverse Battery
- 150mA LDO, +5V (MAX13037) or +3.3V (MAX13038)
- Ultra-Low Operating Current 28µA (typ) in 64ms Scan Mode with LDO ON
- Resistor Adjustable Switching Hysteresis
- Watchdog and Reset
- Built-In Switch Debouncing
- Interrupt Output
- Immunity to Transients
- High Modularity
- Thermal Protection
- ±8kV HBM ESD Protection on IN0–IN7 Without External Components
- Two Inputs (IN0, IN1) Programmable as Direct Outputs
- Four Inputs (IN4–IN7) Programmable for BAT or GND Related Switches
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Applications/Uses
- Body Computers
- Electric Sunroofs
- Other Control ECUs
- Seat Movers
- Window Lifters
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Key Specifications:
| Switch/Contact Monitors |
| Part Number |
Functions |
Switch Inputs |
Switch Input Threshold
(V) |
Switch Input Threshold Hysteresis
(V) |
Output Polarity |
VSUPPLY
(V) |
VSUPPLY
(V) |
ICC
(µA) |
Budgetary Price |
| min |
max |
max |
See Notes |
| MAX13037 |
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8 |
Programmable |
Programmable |
Active Low |
6 |
26 |
57 |
- |
| MAX13038 |
$2.29 @1k |
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See All Switch/Contact Monitors (4)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Typical Operating Circuit
More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-1084
Rev 0;
2007-11-20
This page last modified: 2009-09-01
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