MAX13037ATX+T Maxim Integrated Products, MAX13037ATX+T Datasheet

IC AUTO CONTACT MONITOR 36-TQFN

MAX13037ATX+T

Manufacturer Part Number
MAX13037ATX+T
Description
IC AUTO CONTACT MONITOR 36-TQFN
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX13037ATX.pdf (22 pages)

Specifications of MAX13037ATX+T

Applications
Automotive
Interface
SPI
Voltage - Supply
6 V ~ 26 V
Package / Case
36-TQFN Exposed Pad
Mounting Type
Surface Mount
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX13037/MAX13038 automotive contact monitor
and level shifters monitor and debounce eight remote
mechanical switches and assert an interrupt (INT) if a
switch changes state. The state of each switch is sam-
pled 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 wet-
ting 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 watch-
dog 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.
SPI is a trademark of Motorola, Inc.
19-1084; Rev 0; 11/07
Pin Configuration and Typical Application Circuit at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Body Computers
Window Lifters
Seat Movers
Electric Sunroofs
Other Control ECUs
________________________________________________________________ Maxim Integrated Products
General Description
Level Shifters with LDO Regulator
Applications
Automotive Contact Monitor and
o +6V to +26V Operating Voltage Range
o +42V Compatibility on BAT
o Switch Inputs Withstand Reverse Battery
o 150mA LDO, +5V (MAX13037) or +3.3V
o Ultra-Low Operating Current 28µA (typ) in 64ms
o Resistor Adjustable Switching Hysteresis
o Watchdog and Reset
o Built-In Switch Debouncing
o Interrupt Output
o Immunity to Transients
o High Modularity
o Thermal Protection
o ±8kV HBM ESD Protection on IN0–IN7 Without
o Two Inputs (IN0, IN1) Programmable as Direct
o Four Inputs (IN4–IN7) Programmable for BAT or
+ Denotes a lead-free package.
* EP = Exposed paddle.
M A X13 037 ATX+
M A X13 038 ATX+
(MAX13038)
Scan Mode with LDO ON
External Components
Outputs
GND Related Switches
PART
VO L T A G E
OUTPUT
+3.3V
LDO
+5V
Ordering Information
RANGE
-40°C to
-40°C to
+125°C
+125°C
TEMP
36 TQFN - E P *
36 TQFN - E P *
PACKAGE
( 6m m x
( 6m m x
6m m )
6m m )
PIN-
Features
T3666-3
T3666-3
CODE
PKG
1

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MAX13037ATX+T Summary of contents

Page 1

... Other Control ECUs SPI is a trademark of Motorola, Inc. Pin Configuration and Typical Application Circuit at end of data sheet. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Automotive Contact Monitor and ...

Page 2

Automotive Contact Monitor and Level Shifters with LDO Regulator ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND, unless otherwise noted.) V ........................................................................-0.3V to +6.0V LO BAT.........................................................................-0.3V to +42V IN_ , BATREF...........................................................-45V to +45V IN_ to BAT ...............................................................-45V to +45V SD, ...

Page 3

Level Shifters with LDO Regulator ELECTRICAL CHARACTERISTICS (continued) (BAT = +6V to +26V -40°C to +125°C, unless otherwise noted. Typical values are at BAT = +14V PARAMETER SYMBOL SWITCH INPUTS (IN0–IN7) Input Voltage Threshold Center V ...

Page 4

Automotive Contact Monitor and Level Shifters with LDO Regulator ELECTRICAL CHARACTERISTICS (continued) (BAT = +6V to +26V -40°C to +125°C, unless otherwise noted. Typical values are at BAT = +14V PARAMETER SYMBOL LINEAR REGULATOR Output Voltage ...

Page 5

Level Shifters with LDO Regulator TIMING CHARACTERISTICS (continued) (BAT = +6V to +26V -40°C to +125°C, unless otherwise noted. Typical values are at BAT = +14V PARAMETER SYMBOL SDI to Falling Edge of CLK t Required ...

Page 6

Automotive Contact Monitor and Level Shifters with LDO Regulator CS t LEAD CLK t SI(SU) SDI MSB IN t SO(EN) SDO MSB OUT Figure 1. SPI Timing Characteristics MAX13037/ MAX13038 CS SDO Figure 2. SDO Enable/Disable Test Circuit and Timing ...

Page 7

Level Shifters with LDO Regulator (BAT = +14V 61kΩ, R BAT WET WETTING CURRENT vs. V BAT GND-CONNECTED SWITCH 0 -10 BAT-CONNECTED SWITCH -20 - ...

Page 8

Automotive Contact Monitor and Level Shifters with LDO Regulator (BAT = +14V 61kΩ, R BAT WET SWITCHING THRESHOLD vs. TEMPERATURE 10 ADJUSTABLE HYSTERESIS OFF RISING IN_ 7 V FALLING IN_ 6 ...

Page 9

61kΩ, R BAT WET V TRANSIENT LOAD REGULATION 50mA/div V LO (AC-COUPLED) 50mV/div 1ms/div PIN NAME 1, 15, 31 GND Ground Switch Input Channel 0. Connect IN0 to ...

Page 10

Automotive Contact Monitor and Level Shifters with LDO Regulator PIN NAME Shutdown Input. Drive SD low to place the MAX13037/MAX13038 into shutdown mode and disable SD 19 the linear regulator. Drive SD high for normal operation compatible with ...

Page 11

Level Shifters with LDO Regulator SD MAX13037 MAX13038 REGON WAKE-UP LOGIC REGOFF BATREF IN0 IN1 IN2 WETTING IN3 CURRENT CONTROL IN4 IN5 IN6 IN7 WET Detailed Description The MAX13037/MAX13038 automotive contact monitor and level shifters monitor and debounce eight remote ...

Page 12

Automotive Contact Monitor and Level Shifters with LDO Regulator BAT is the main power-supply input. Bypass BAT to ground with a 0.1µF ceramic capacitor placed as close as possible to BAT. In addition, bypass BAT with a 10µF or greater ...

Page 13

Level Shifters with LDO Regulator Mechanical Switch Inputs (IN0–IN7) IN0–IN7 are the inputs for remote mechanical switches. The status of each switch input is indicated by the SW0 through SW7 bits in the status register, and each switch input can ...

Page 14

Automotive Contact Monitor and Level Shifters with LDO Regulator Wetting Current (WET) The MAX13037/MAX13038 feature adjustable wetting current to any closed switch to clean switch contacts that are exposed to adverse conditions. The wetting current is set by connecting a ...

Page 15

Level Shifters with LDO Regulator STATUS REGISTER IS COPIED TO SHIFT REGISTER CS CLK SDI WTOFF SC2 SC1 SC0 SDO SW7 SW6 SW5 * = UNUSED. Figure 7. SPI Read/Write Example Serial Peripheral Interface ( CS ...

Page 16

Automotive Contact Monitor and Level Shifters with LDO Regulator Notes: Bit 15: Wetting Current Mode (WTOFF) Set the WTOFF bit to configure the wetting currents as continuous on closed switches. Clear the WTOFF bit to configure the wetting current as ...

Page 17

Level Shifters with LDO Regulator Table 5. Switch Configuration Controlled by M1 and M0 IN7 AND IN6 SWITCH M1 M0 CONFIGURATION 0 0 Ground 0 1 Ground 1 0 Battery 1 1 Battery IN1 (see Table 4). The DO0 and ...

Page 18

Automotive Contact Monitor and Level Shifters with LDO Regulator at which point the command register is restored to its power-up default (0x00) and the MAX13037/ MAX13038 enter scan mode. Note that SD is compati- ble with both logic and BAT ...

Page 19

Automotive Contact Monitor and Level Shifters with LDO Regulator TOP VIEW DO0 28 *EP THRESH 29 WDI 30 GND 31 32 BATREF MAX13037/MAX13038 N. BAT + BAT 36 (6mm x 6mm) *CONNECT EXPOSED PADDLE TO ...

Page 20

Automotive Contact Monitor and Level Shifters with LDO Regulator 0.01μF DO0 DO1 4700pF TDEB MAX13036 WET 90kΩ HYST 30kΩ GND Chip Information PROCESS: BiCMOS 20 ______________________________________________________________________________________ Typical Operating Circuit ECU CONNECTOR 0.01μF BATREF BATREF BAT BAT 47μF 0.1μF 0.1μF SDI ...

Page 21

Level Shifters with LDO Regulator (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) ______________________________________________________________________________________ Automotive Contact Monitor and Package Information 21 ...

Page 22

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 22 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2007 Maxim Integrated Products Package Information (continued registered trademark of Maxim Integrated Products, Inc ...

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