MAXIM MAX13362 User Manual

General Description

The MAX13362 is a 24-channel automotive contact mon­itor designed as an interface between mechanical
switches and low-voltage processors or other logic cir­cuits. The IC operates over a voltage range of 5.5V to
28V, and withstands voltages up to 40V. It protects low­voltage circuitry from high voltages and reverse battery
conditions. The MAX13362’s low-current operation under
all operating conditions makes it suitable for use in elec­tronic control units (ECUs) that are connected directly to
the automotive battery. It has an adjustable scan mode
that significantly reduces the current drawn in key-off.

The MAX13362 features an SPI™ interface to monitor
the switch status and set the device configuration.
Multiple MAX13362s can be cascaded to support any
multiple of 24 switches.

The MAX13362 is available in a 6mm x 6mm, 40-pin
thin QFN package and operates over the -40°C to
+125°C temperature range.

Applications

Automotive Body Controllers

Automotive Door Modules

Automotive Smart Junction Boxes

Features

♦ 9V to 18V Operating Voltage Range with Full

Performance

♦ Fully Functional Range of 5.5V to 28V

♦ Switch Inputs Withstand 27V

♦ Switch Inputs Withstand Reverse Battery

♦ Ultra-Low Operating Current 100µA (typ) in Scan

Mode

♦ Built-In Switching Hysteresis

♦ Built-In Switch Deglitching

♦ CMOS-Compatible Logic Outputs Down to 3.0V

♦ Interrupt Output to Processor

♦ Configurable Wetting Current (0mA, 5mA, 10mA,

or 15mA) for Each Switch Input

♦ AEC-Q100 Qualified

MAX13362

24-Channel Automotive Switch Monitor

________________________________________________________________

Maxim Integrated Products

1

19-4464; Rev 0; 2/09

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.

EVALUATION KIT

AVAILABLE

Ordering Information

*

EP = Exposed pad.

+

Denotes a lead(Pb)-free/RoHS-compliant package.

/V Denotes an automotive qualified part.

Typical Application Circuit

Pin Configuration

SPI is a trademark of Motorola, Inc.

PART TEMP RANGE PIN-PACKAGE

M AX 13362ATL/V + -40°C to +125°C

40 Thin QFN-EP*

(6mm x 6mm)

0.047μF

24 SWITCHES, 1 BATTERY-CONNECTED

ECU CONNECTOR

0.047μF

100Ω

IN1

IN6

IN7

IN9

IN8

IN23

IN21

IN20

IN19

IN22

GND

SDI

IN13

IN14

IN15

IN16

IN17

IN18

SDO CS

MICROCONTROLLER

IN12

MAX13362

/LOGIC CIRCUIT

IN5

IN10

IN11

CLK

IN0

IN4

IN3

IN2

VS

REGULATOR

V

DD

SD

INT

BATTERY
9V TO 18V

IN

OUT

TOP VIEW

IN16

30 N.C.

29 N.C.

31IN7

32IN8

33IN9

34IN10

35IN11

36IN12

37IN13

38IN14

39IN15

40

+

1N.C.

2N.C.

28 IN6

27 IN5

26 IN4

25 IN3

24 IN2

23 IN1

22 IN0

21 SD

MAX13362

3IN17

4IN18

5IN19

6IN20

7IN21

8IN22

9IN23

10INT

THIN QFN

(6mm x 6mm)

20 VS

19 VS

18 GND

17 V

16 GND

15 SDI

14 CS

13 SDO

12 CLK

11 N.C.

DD

MAX13362

24-Channel Automotive Switch Monitor

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATING

ELECTRICAL CHARACTERISTICS

(V

DD

= 5V, VVS= 14V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at TA=+25°C.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

VDD, CLK, SDI, CS to GND ......................................-0.3V to +6V

VS, SD, INT to GND................................................-0.3V to +40V

IN0–IN23 to GND.....................................................-15V to +27V

SDO to GND...............................................-0.3V to (V

DD

+ 0.3V)

ESD Protection, All Pins (HBM)............................................±2kV

ESD Protection on Pins IN0–IN23 to IEC 61000-4-2 Specification

(with added 0.047µF capacitor, and/or 100Ω resistor)....±8kV

Current Into Any Pin..........................................................±20mA

Continuous Power Dissipation (T

A

= +70°C)

(derate 37mW/°C above +70°C)(multilayer board)....2963mW

Operating Temperature Range .........................-40°C to +125°C

Junction Temperature........................................-40°C to +150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

POWER SUPPLY

VDD Operating Supply Range V

VDD Supply Current I

VS Supply Range V

VS Undervoltage Lockout V

Total Supply Current (Flowing
into VS and V

DD

)

VS Supply Current in Shutdown
Mode

VDD Supply Current in Shutdown
Mode

SWITCH INPUTS

Input Voltage Threshold V

Input Hysteresis V

Wetting Current Rise/Fall Time t

Wetting Current I

IN0–IN23 Input Current I

IN0–IN23 Input Leakage Current
in Shutdown

IN4–IN23 Dropout Voltage V

DD

DD

(Note 1) 5.5 28 V

VS

UVLO

t
internal register = 0, 24 channels active, all
switches open, T

I

SUP

t
internal register = 0, 24 channels active, all
switches open

Continuous polling mode, wetting current
set to 5mA

I

SDVS

I

SDVDDVSD

TH

IWETT

VSD = 0, VVS = 14V, all switches open, TA =
+25°C

VVS = 5.5V to 28V, measured with 100Ω
series resistor for high-side switches

VVS = 5.5V to 28V, measured with 100Ω

H

series resistor for high-side switches

Wetting current set to 15mA,
9V

WETT

Wetting current set to 15mA,
(5.5V

IN_

I

LEAKSDVVS

DO15IWETT

V

V

= 64ms, t

POLL

= 64ms, t

POLL

= 0, VVS = 14V, TA = +25°C 0.1 5 µA

< VVS < 18V

< VVS < 9V) or (18V < VVS < 28V)

= 0, TA = +25°C 2

IN_

= 14V, TA = +25°C (Note 2) 16 30

IN_

= 0 or 14V, VSD = 0, TA = +25°C ±2 µA

= 15mA (Note 3) 2.8 4.0 V

3 5.5 V

0.1 10 µA

3 5.5 V

POLL_ACT

= 1ms; LP bit in

100 170

= +25°C

A

POLL_ACT

= 1ms; LP bit in

100 200

1000

610µA

2.5 3.7 V

0.2 V

5µs

12.7 15 17.25

10.5 15 19.5

µA

mA

µA

MAX13362

24-Channel Automotive Switch Monitor

_______________________________________________________________________________________ 3

)

)

ELECTRICAL CHARACTERISTICS (continued)

(V

DD

= 5V, VVS= 14V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at TA=+25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

LOGIC LEVELS

INT Output-Voltage Low V

SDO Output-Voltage Low V

SDO Output-Voltage High V

SDO Leakage Current in High­Impedance Mode

OLSDO

OHSDO

I

SDI, CLK, CS Input-Voltage Low V
SDI, CLK, CS Input-Voltage High V

SD Input Low Voltage V
SD Input High Voltage V

SDI Internal Pulldown Resistor R

CLK Pin Leakage I

CS Pin Leakage I
SD Pin Leakage I
INT Pin Leakage I

LEAKCLKVCLK

LEAKCS

LEAKSDVSD

LEAKINTVINT

THERMAL SHUTDOWN

Thermal Shutdown Threshold T

Thermal Shutdown Hysteresis T

TIMING

Switch Inputs Deglitching Time t

CLK Frequency Range f
Falling Edge of CS to Rising

Edge of CLK Setup Time

t

Falling Edge of CLK to Rising
Edge of CS Setup Time

SDI-to-CLK Falling Edge Setup
Time

SDI Hold Time After Falling Edge
of CLK

Time from Rising Edge of CLK to
SDO Data Valid

Time from Falling Edge of CS to
SDO Low Impedance

Time from Rising Edge of CS to
SDO High Impedance

t

SI(SU)

t

SI(HOLD

t

VALID

t

SO(EN)

t

SDO(DIS

OLINT

LSDO

ILSD

IHSD

PD

SHDN

HYST

GT

CLK

LEAD

t

LAG

Sinking 1mA 0.4 V

Sinking 1mA 0.2 x V

Sourcing 1mA 0.8 x V

VCS = 5V -1 +1 µA

IL

IH

= 5V, TA = +25°C 1 µA

VCS = 5V, TA = +25°C 1 µA

= 5V, TA = +25°C 1 µA

= high impedance, TA = +25°C 1 µA

Temperature rising (Note 4) +150 +165 °C

(Note 4) 0.01 4 MHz

Polling mode, input rise/fall time
< 10ns (Note 4)

Input rise/fall time < 10ns
(Note 4)

(Note 4) 30 ns

(Note 4) 20 ns

C

= 50pF (Note 3) 70 ns

SDO

(Note 4) 55 ns

(Note 4) 55 ns

DD

DD

0.33 x V

D D

0.66 x V

D D

0.8 V

2.4 V

30 50 120 kΩ

15 °C

37 50 63 µs

100 ns

100 ns

V

V

V

V

MAX13362

24-Channel Automotive Switch Monitor

4 _______________________________________________________________________________________

Figure 1. SPI Timing Characteristics

ELECTRICAL CHARACTERISTICS (continued)

(V

DD

= 5V, VVS= 14V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at TA=+25°C.)

Note 1: When V

VS

is above 28V, the wetting current is disabled to limit power dissipation, and the switch inputs are not monitored.

When V

VS

returns, there is a 1ms blanking time before the external switches are polled.

Note 2: This current only flows during the polling active time thus the average value is much lower. For example with a polling time

of 64ms and a polling active time of 1ms the average current on an input when connected to 14V is typically 16µA x 1/64 =

0.25µA.

Note 3: Difference between VS and IN_ voltage when wetting current has dropped to 90% of its nominal value.
Note 4: Guaranteed by design.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Polling Active Time Accuracy t

POLL_ACT

Polling Time Accuracy t

Time from Shutdown to Normal
Operation

POLL

t

START

-20 +20 %

-20 +20 %

0.1 1 ms

CS

t

LEAD

CLK

t

SI(SU)tSI(HOLD)

SDI MSB IN

t

SO(EN)

SDO

MSB OUT LSB OUT

t

VALID

t

LAG

t

SDO(DIS)

MAX13362

24-Channel Automotive Switch Monitor

_______________________________________________________________________________________ 5

Typical Operating Characteristics

(V

DD

= VSD= 5V, VVS= 14V, TA= +25°C, unless otherwise noted.)

WETTING CURRENT vs. VS VOLTAGE

20

15

10

WETTING CURRENT (mA)

5

0

5187109811612

VS VOLTAGE (V)

13 161514 17

WETTING CURRENT

(POLLING MODE)

5mA

I

WETT

I

WETT

I

WETT

MAX13362 toc01

= 15mA

= 10mA

= 5mA

MAX13362 toc04

WETTING CURRENT vs. TEMPERATURE

20

15

10

WETTING CURRENT (mA)

5

0

-40 8020-20 120 14010060

VS SUPPLY CURRENT vs. TEMPERATURE

2600

2200

1800

400

TEMPERATURE (°C)

(CONTINUOUS MODE)

I

= 15mA FOR ALL CHANNELS

WETT

I

= 10mA FOR ALL CHANNELS

WETT

SWITCH STATUS CHANGE

I

WETT

I

WETT

I

WETT

= 15mA

= 10mA

= 5mA

MAX13362 toc02

MAX13362 toc05

(CONTINUOUS MODE)

V

10V

IN0

I

WETT

V

V

0mA

INT

CS

5mA

10ms/div

VS SUPPLY CURRENT vs. TEMPERATURE

(POLLING MODE)

130

120

POLLING TIME = 65.536ms
POLLING ACTIVE TIME = 1.024ms
ALL CHANNELS OPEN

= 5mA

I

WETT

MAX13362 toc03

0V

10V/div

5mA/div

2V/div

2V/div

MAX13362 toc06

4.096ms POLLING TIME

WETTING CURRENT (5mA/div)

512μs POLLING ACTIVE TIME

1ms/div

VS SUPPLY CURRENT vs. TEMPERATURE

(SHUTDOWN MODE)

6.5

6.2

5.9

5.6

SUPPLY CURRENT (μA)

5.3

5.0

-40 -20 20 8040 140100 120

600

TEMPERATURE (°C)

1400

1000

SUPPLY CURRENT (μA)

600

200

3.4

MAX13362 toc07

3.3

3.2

SWITCH THRESHOLD (V)

3.1

3.0

I

= 5mA FOR ALL CHANNELS

WETT

ALL CHANNELS OPEN

I

= 0mA FOR ALL CHANNELS

WETT

400-40 8020-20 120 14010060

TEMPERATURE (°C)

SWITCH THRESHOLD vs. TEMPERATURE

(HIGH SIDE SWITCH)

MAX13362 toc08

SWITCH OPEN TO CLOSE

SWITCH CLOSE TO OPEN

HIGH SIDE SWITCH
15mA WETTING CURRENT
100Ω INCLUDED

-40 140080

20 12040 10060-20

TEMPERATURE (°C)

110

SUPPLY CURRENT (μA)

100

90

-40 140080

20 12040 10060-20

TEMPERATURE (°C)

SWITCH THRESHOLD vs. TEMPERATURE

(LOW-SIDE SWITCH)

3.4

3.3

3.2

SWITCH THRESHOLD (V)

3.1

3.0

-40 140080

SWITCH OPEN TO CLOSE

SWITCH CLOSE TO OPEN

LOW-SIDE SWITCH
15mA WETTING CURRENT

20 12040 10060-20

TEMPERATURE (°C)

MAX13362 toc09