Rainbow Electronics 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

PART TEMP RANGE PIN-PACKAGE

M AX 13362ATL/V +

40 Thin QFN-EP*

(6mm x 6mm)

*

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.

-40°C to +125°C

24 SWITCHES, 1 BATTERY-CONNECTED

ECU CONNECTOR

0.047μF

IN7

IN9

IN23

IN21

IN20

IN15

IN16

IN17

IN19

IN22

IN18

GND

SDO CS

SDI

IN10

IN11

IN12

IN13

IN14

MAX13362

CLK

MICROCONTROLLER

/LOGIC CIRCUIT

IN8

100Ω

IN1

IN6

IN5

IN0

IN4

IN3

IN2

VS

V

DD

SD

INT

0.047μF

BATTERY
9V TO 18V

IN

REGULATOR

OUT

TOP VIEW

IN16

30 N.C.

29 N.C.

28 IN6

27 IN5

26 IN4

25 IN3

24 IN2

23 IN1

22 IN0

21 SD

31IN7

32IN8

33IN9

34IN10

35IN11

36IN12

37IN13

38IN14

39IN15

40

+

1N.C.

2N.C.

3IN17

MAX13362

4IN18

5IN19

6IN20

THIN QFN

(6mm x 6mm)

7IN21

8IN22

9IN23

20 VS

19 VS

18 GND

17 V

DD

16 GND

15 SDI

14 CS

13 SDO

12 CLK

11 N.C.

10INT

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 IEC61000-4-2 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

CONDITIONS

POWER SUPPLY

VDD Operating Supply Range V

DD

35.5V

VDD Supply Current I

DD

0.1 10 µA

VS Supply Range V

VS

(Note 1) 5.5 28 V

VS Undervoltage Lockout V

UVLO

35.5V

t

POLL

= 64ms, t

POLL_ACT

= 1ms; LP bit in

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

A

= +25°C

170

t

POLL

= 64ms, t

POLL_ACT

= 1ms; LP bit in

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

200

Total Supply Current (Flowing
into VS and V

DD

)

I

SUP

Continuous polling mode, wetting current
set to 5mA

µA

VS Supply Current in Shutdown
Mode

I

SDVS

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

610µA

VDD Supply Current in Shutdown
Mode

I

SDVDDVSD

= 0, VVS = 14V, TA = +25°C 0.1 5 µA

SWITCH INPUTS

Input Voltage Threshold V

TH

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

2.5 3.7 V

Input Hysteresis V

H

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

0.2 V

Wetting Current Rise/Fall Time t

IWETT

5µs

Wetting current set to 15mA,
9V

<

VVS

<

18V

15

Wetting Current I

WETT

Wetting current set to 15mA,
(5.5V

<

VVS < 9V) or (18V < VVS

<

28V)

15

mA

V

IN_

= 0, TA = +25°C 2

IN0–IN23 Input Current I

IN_

V

IN_

= 14V, TA = +25°C (Note 2) 16 30

µA

IN0–IN23 Input Leakage Current
in Shutdown

VVS = 0 or 14V, VSD = 0, TA = +25°C ±2 µA

IN4–IN23 Dropout Voltage V

DO15IWETT

= 15mA (Note 3) 2.8 4.0 V

SYMBOL

MIN TYP MAX UNITS

1000

12.7

10.5

I

LEAKSD

100

100

17.25

19.5

MAX13362

24-Channel Automotive Switch Monitor

_______________________________________________________________________________________ 3

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

LOGIC LEVELS

INT Output-Voltage Low V

OLINT

Sinking 1mA 0.4 V

SDO Output-Voltage Low

Sinking 1mA

V

SDO Output-Voltage High

Sourcing 1mA

V

SDO Leakage Current in High­Impedance Mode

I

LSDO

VCS = 5V -1 +1 µA

SDI, CLK, CS Input-Voltage Low

V

IL

V

SDI, CLK, CS Input-Voltage High

V

IH

V

SD Input Low Voltage V

ILSD

0.8 V

SD Input High Voltage V

IHSD

2.4 V

SDI Internal Pulldown Resistor R

PD

30 50 120 kΩ

CLK Pin Leakage

V

CLK

= 5V, TA = +25°C 1 µA

CS Pin Leakage

VCS = 5V, TA = +25°C 1 µA

SD Pin Leakage

VSD = 5V, TA = +25°C 1 µA

INT Pin Leakage

V

INT

= high impedance, TA = +25°C 1 µA

THERMAL SHUTDOWN

Thermal Shutdown Threshold T

SHDN

Temperature rising (Note 4)

°C

Thermal Shutdown Hysteresis T

HYST

15 °C

TIMING

Switch Inputs Deglitching Time t

GT

37 50 63 µs

CLK Frequency Range f

CLK

(Note 4)

4 MHz

Falling Edge of CS to Rising
Edge of CLK Setup Time

t

LEAD

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

ns

Falling Edge of CLK to Rising
Edge of CS Setup Time

t

LAG

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

ns

SDI-to-CLK Falling Edge Setup
Time

t

SI(SU)

(Note 4) 30 ns

SDI Hold Time After Falling Edge
of CLK

)

(Note 4) 20 ns

Time from Rising Edge of CLK to
SDO Data Valid

t

VALID

C

SDO

= 50pF (Note 3) 70 ns

Time from Falling Edge of CS to
SDO Low Impedance

t

SO(EN)

(Note 4) 55 ns

Time from Rising Edge of CS to
SDO High Impedance

)

(Note 4) 55 ns

ELECTRICAL CHARACTERISTICS (continued)

(V

DD

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

V

OLSDO

V

OHSDO

0.8 x V

DD

0.2 x V

0.33 x V

0.66 x V

D D

I

LEAKCLK

I

LEAKCS

I

LEAKSD

I

LEAKINT

+150 +165

0.01

100

100

t

SI(HOLD

t

SDO(DIS

DD

D D

MAX13362

24-Channel Automotive Switch Monitor

4 _______________________________________________________________________________________

CS

CLK

SDI MSB IN

MSB OUT LSB OUT

t

SDO(DIS)

t

VALI D

t

SO(EN)

t

LEAD

SDO

t

LAG

t

SI(SU)tSI(HOLD)

Figure 1. SPI Timing Characteristics

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Polling Active Time Accuracy

-20

%

Polling Time Accuracy t

POLL

-20

%

Time from Shutdown to Normal
Operation

t

START

0.1 1 ms

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.

t

POLL_ACT

+20

+20

MAX13362

24-Channel Automotive Switch Monitor

_______________________________________________________________________________________ 5

WETTING CURRENT vs. VS VOLTAGE

MAX13362 toc01

VS VOLTAGE (V)

WETTING CURRENT (mA)

13 161514 17

5

10

15

20

0

5187109811612

I

WETT

= 15mA

I

WETT

= 10mA

I

WETT

= 5mA

WETTING CURRENT vs. TEMPERATURE

MAX13362 toc02

TEMPERATURE (°C)

WETTING CURRENT (mA)

400

5

10

15

20

0

-40 8020-20 120 14010060

I

WETT

= 15mA

I

WETT

= 10mA

I

WETT

= 5mA

VS SUPPLY CURRENT vs. TEMPERATURE

(CONTINUOUS MODE)

MAX13362 toc05

TEMPERATURE (°C)

SUPPLY CURRENT (μA)

1000

1400

2200

600

1800

2600

200

I

WETT

= 15mA FOR ALL CHANNELS

I

WETT

= 10mA FOR ALL CHANNELS

I

WETT

= 5mA FOR ALL CHANNELS

ALL CHANNELS OPEN

I

WETT

= 0mA FOR ALL CHANNELS

400-40 8020-20 120 14010060

VS SUPPLY CURRENT vs. TEMPERATURE

(POLLING MODE)

MAX13362 toc06

TEMPERATURE (°C)

SUPPLY CURRENT (μA)

20 12040 10060-20

100

110

120

130

90

-40 140080

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

WETT

= 5mA

VS SUPPLY CURRENT vs. TEMPERATURE

(SHUTDOWN MODE)

MAX13362 toc07

TEMPERATURE (°C)

SUPPLY CURRENT (μA)

600

5.6

5.3

5.9

6.2

6.5

5.0

-40 -20 20 8040 140100 120

Typical Operating Characteristics

(V

DD

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

WETTING CURRENT

(POLLING MODE)

5mA

MAX13362 toc04

SWITCH STATUS CHANGE

I

WETT

(CONTINUOUS MODE)

V

10V

IN0

0mA

V

INT

V

CS

5mA

10ms/div

MAX13362 toc03

0V

10V/div

5mA/div

2V/div

2V/div

4.096ms POLLING TIME

WETTING CURRENT (5mA/div)

512μs POLLING ACTIVE TIME

1ms/div

SWITCH THRESHOLD vs. TEMPERATURE

(HIGH SIDE SWITCH)

3.4

3.3

SWITCH OPEN TO CLOSE

3.2

SWITCH THRESHOLD (V)

3.1

3.0

-40 140080

SWITCH CLOSE TO OPEN

HIGH SIDE SWITCH
15mA WETTING CURRENT
100Ω INCLUDED

20 12040 10060-20

TEMPERATURE (°C)

MAX13362 toc08

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