Maxim MAX13036, MAX13036ATI+ Datasheet

General Description

The MAX13036 automotive contact monitor and level
shifter monitors and debounces eight remote mechanical
switches and asserts an interrupt (INT) if a switch
changes state. The state of each switch is sampled
through an SPI™ interface by reading the status register
and 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 MAX13036 supplies an adjustable wetting current to
each closed switch to clean mechanical switch contacts
that are exposed to adverse conditions.

The MAX13036 operates with a +6V to +26V battery volt­age applied to BAT. A separate +2.7V to +5.5V logic sup­ply input (V

L

) sets the interface voltage. The MAX13036 is
available in a 5mm x 5mm 28-pin TQFN package and
operates over the -40°C to +125°C temperature range.

Applications

Features

o +6V to +26V Operating Voltage Range

o +42V Compatibility on BAT

o Inputs Withstand Reverse Battery

o Withstands Dynamic Battery Voltage Drop While

V

L

is Present

o Ultra-Low Operating Current 17µA (typ) in

Scan Mode

o Resistor-Adjustable Switching Hysteresis

o CMOS-Compatible Logic Outputs (+2.7V min)

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

External Components

o Two Inputs (IN0, IN1) Programmable as Direct

Outputs

o Four Inputs (IN4–IN7) Programmable for BAT or

GND Related Switches

MAX13036

Automotive Contact Monitor

and Level Shifter

________________________________________________________________

Maxim Integrated Products

1

Pin Configuration

19-0808; Rev 0; 4/07

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.

EVALUATION KIT

AVAILABLE

Ordering Information

+

Denotes lead-free package.

*

EP = Exposed paddle.

Body Computers

Window Lifters

Seat Movers

Electric Sunroofs

Other Control ECUs

Typical Application Circuit appears at end of data sheet.

SPI is a trademark of Motorola, Inc.

TOP VIEW

DO0

SD

GND

BATREF

BAT

N.C.

INO

*CONNECT EXPOSED PADDLE TO GROUND

DO1

21

22

*EP

23

24

25

26

27

+

28

1

IN1

N.C.

20

2

IN2

L

CLK

V

19

18

MAX13036

3

4

IN3

IN4

TQFN

SDI

SDO

CS

17

16

15

INT

14

13

OT

12

GND

11

TDEB

10

WET

9

HYST

N.C.

8

5

6

7

IN6

IN5

IN7

PART TEMP RANGE

MAX13036ATI+ -40°C to +125°C

PIN­PACKAGE

28 TQFN-EP*
(5mm x 5mm)

PKG
CODE

T2855-8

MAX13036

Automotive Contact Monitor
and Level Shifter

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VL= +2.7V to +5.5V, BAT = +6V to +26V, SD = VL, TA= -40°C to +125°C, unless otherwise noted. Typical values are at VL= +3.3V,
BAT = +14V, T

A

= +25°C) (Note 1)

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.

(All voltages referenced to GND, unless otherwise noted.)
V

L

...........................................................................-0.3V to +6.0V

BAT.........................................................................-0.3V to +42V

BATREF, IN_ to BAT ................................................-45V to +45V

BATREF, IN_ to GND...............................................-45V to +45V

SD...........................................................................-0.3V to +45V

HYST, WET, TDEB, OT, INT .....................................-0.3V to 6.0V

CS, CLK, SDI, SDO, DO0, DO1 ....................-0.3V to (V

L

+ 0.3V)

Continuous Current (CS, CLK, SDI, SDO, DO0, DO1) .....±20mA

HBM ESD Protection (IN0–IN7)............................................±8kV

Continuous Power Dissipation (T

A

= +70°C, multilayer board)

28-Pin TQFN (derate 34.5mW/°C above +70°C) .......2759mW

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

Junction Temperature......................................................+150°C

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

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

POWER SUPPLY

VL Supply Range V

VL Supply Current I

BAT Supply Range V

Total Supply Current I

Total Supply Current in Scan
Mode

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

L

VL = +5.5V, V

L

BAT

VL = +5V, V
scan, programmable hysteresis off,

SUP

M0 = M1 =1, WEND = 1, IN0–IN7 =
unconnected,
CS = V

L

V

= +14V, scan mode (SC0 = 0,

I

SUP_SCAN

BAT

SC1= 0, SC2 = 0), CS = V
SDI = CLK = GND (Note 2)

2.7 5.5 V

= +14V 0 1 µA

BAT

626V

= +14V, continuous

BAT

46 80 µA

, SDI = CLK = GND (Note 2)

,

L

17 36 µA

Total Supply Current in Shutdown
Mode

BATREF Input Leakage Current in
Shutdown

BATREF Input Resistance R

VSD = 0V,
V

I

SHDN

BAT

V

B AT RE F

(Note 2)

I

L_BATREFVSD

BATREFVBATREF

= +14V,

= + 14V

= 0V, V

= +14V 1 MΩ

TA = +25°C 2 3.2

T

= -40°C to +125°C 2 4.0

A

= +14V 1 µA

BATREF

SWITCH INPUTS (IN0–IN7)

R

Input-Voltage Threshold Center
(Note 3)

Input-Voltage Threshold
Hysteresis (Note 4)

V

TH_C

V

TH_HYS

= ∞ or programmable hysteresis

HYST

disabled

R

= 90kΩ

HYST

R

= ∞ or programmable hysteresis

HYST

disabled

R

= 90kΩ

HYST

R

= 0Ω

HYST

0.425 x

V

BATREF

0.4 x

V

BATREF

0.133 x

V

BATREF

0.26 x

V

BATREF

0.5 x

V

BATREF

0.5 x

V

BATREF

0.166 x

V

BATREF

0.361 x

V

BATREF

0.5 x

V

BATREF

0.575 x

V

BATREF

0.63 x

V

BATREF

0.22 x

V

BATREF

0.48 x

V

BATREF

µA

V

V

MAX13036

Automotive Contact Monitor

and Level Shifter

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VL= +2.7V to +5.5V, BAT = +6V to +26V, SD = VL, TA= -40°C to +125°C, unless otherwise noted. Typical values are at VL= +3.3V,
BAT = +14V, T

A

= +25°C) (Note 1)

Switch-State Sense Resistor R

Wetting Current Rise/Fall Time

Wetting Current I

IN0–IN7 Input Impedance in
Shutdown

LOGIC-LEVELS

SDO, DO0, DO1 Output
Voltage High

SDO, DO0, DO1 Output
Voltage Low

INT, OT Output Voltage Low V
SD Input Leakage Current I
SD Input-Voltage Low V
SD Input-Voltage High V

CS, CLK, SDI Input-Voltage Low V

CS, CLK, SDI Input-Voltage High V

CS, CLK Input Leakage Current I
INT, OT Leakage Current I

SDI Input Impedance R

THERMAL SHUTDOWN

Thermal Shutdown Temperature T

Thermal Shutdown Hysteresis T

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SENSE

I

WET_RISE_

FALL

WET

V

OH

V

OL

INTL

L_SD

IL_SD

IH_SD

IL

IH

IL

OL

SDI

SHDN

HYST

R

= 61kΩ

WET

(Note 5)

R

= 61kΩ 22

WET

R

= 30kΩ, V

WET

R

= 330kΩ 7.5

WET

= 0V, V

V

SD

Source current = 2mA 0.8 x V

Sink current = 4mA 0.2 x V

Sink current = 4mA 0.4 V

VSD = V

IN

= +12V 15 30 µA

BAT

Rise 6

Fall 1

= 14V 28 40 51

BAT

_ = +14V 5.5 8.5 MΩ

11 16 22 kΩ

L

L

0.8

2.4 V

0.33 x
V

L

0.66 x
V

L

-1 +1 µA

-1 +1 µA

65 100 145 kΩ

+170 °C

15 °C

µs

mA

V

V

V

V

V

MAX13036

Automotive Contact Monitor
and Level Shifter

4 _______________________________________________________________________________________

TIMING CHARACTERISTICS

(VL= +2.7V to +5.5V, BAT = +6V to +26V, SD = VL, TA= -40°C to +125°C, unless otherwise noted. Typical values are at VL= +3.3V,
BAT = +14V, T

A

= +25°C) (Note 1)

)

Note 1: All units are 100% production tested at TA= +125°C. Limits over the operating temperature range are guaranteed by

correlation to the +125°C tests.

Note 2: The total supply current is the sum of the current flowing into V

L

, BAT, and BATREF.

Note 3: V

TH_C

= (V

TH_HIGH

+ V

TH_LOW

)/2.

Note 4: V

TH_HYS

= (V

TH_HIGH

- V

TH_LOW

).

Note 5: Wetting current rise/fall time is measured as the time from 10% to 90% of the maximum wetting current.
Note 6: Guaranteed by design.

IN0 to DO0 Propagation Delay V

IN1 to DO1 Propagation Delay

CLK Frequency f

Falling Edge of CS to Rising Edge
of CLK Required Setup Time

Falling Edge of CLK to Rising
Edge of CS Required Setup Time

SDI Valid to Falling Edge of CLK
Required Setup Time

Falling Edge of CLK to SDI
Required Hold Time

Time From Falling Edge of CS to
SDO Low Impedance

Time From Rising Edge of CS to
SDO High Impedance

Time from Rising Edge of CLK to
SDO Data Valid

Debounce time t

Scanning Time Pulse t

Scanning Time Period t

Wetting Time Pulse t

Time from Shutdown To Normal
Operation

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

= 6V 22 35

t

PROP

CLK

t

LEAD

t

LAG

t

SI(SU)

t

SI(HOLD

t

SO(EN)

t

SO(DIS)VL

t

VALID

DEB

SCAN

SCAN_P

WET

BAT

V

= +14V 22

BAT

Input rise/fall time < 2ns,
V

= +3.0V to +5.5V

L

Input rise/fall time < 2ns,
V

= +3.0V to +5.5V, Figure 1

L

Input rise/fall time < 2ns,
V

= +3.0V to +5.5V, Figure 1

L

Input rise/fall time < 2ns,
V

= +3.0V to +5.5V, Figure 1

L

Input rise/fall time < 2ns,
V

= +3.0V to +5.5V, Figure 1

L

Input rise/fall time < 2ns,
V

= +3.0V to +5.5V, Figure 1

L

110 ns

50 ns

30 ns

20 ns

5 MHz

55 ns

= +3.0V to +5.5V, Figures 1 and 2 55 ns

C

=15pF,

SDO

= +3.0V to +5.5V, Figure 1

V

L

C

= 500pF 3.18 5.9 9.42

TDEB

C

= 10nF (Note 6) 63 120 188

TDEB

70 ns

130 250 400 µs

SC2 = 0, SC1 = 1, SC0 = 1 4 8 14 ms

WTOFF = 0 10 21 35 ms
SD low-to-high transition to input

monitoring enabled

200 µs

µs

ms

MAX13036

Automotive Contact Monitor

and Level Shifter

_______________________________________________________________________________________ 5

Test Circuits/Timing Diagrams

Figure 1. SPI Timing Characteristics

Figure 2. SDO Enable/Disable Test Circuit and Timing Diagram

CS

t

LEAD

CLK

SDI MSB IN

t

SO(EN)

SDO

MAX13036

t

SI(SU)tSI(HOLD)

t

VALID

MSB OUT LSB OUT

V

L

SDO

CS

t

SO(EN)

1/3V

L

1kΩ

SDOCS

15pF

t

LAG

t

SO(DIS)

t

SO(DIS)

VOL + 0.1V

L

MAX13036

Automotive Contact Monitor
and Level Shifter

6 _______________________________________________________________________________________

Typical Operating Characteristics

(VL= +3.3V, BAT = +14V, SD = VL, R

WET

= 61kΩ, R

HYST

= 90kΩ, C

TDEB

= 4700pF, TA= +25°C, unless otherwise noted.)

WETTING CURRENT vs. V

BAT

V

BAT

(V)

WETTING CURRENT (mA)

MAX13036 toc01

6 1014182226

-30

-20

-10

0

10

20

30

40

GND-CONNECTED SWITCH

BAT-CONNECTED SWITCH

WETTING CURRENT vs. R

WET

R

WET

(kΩ)

WETTING CURRENT (mA)

MAX13036 toc02

30 80 130 180 230 280 330

-60

-50

-40

-30

-20

-10

0

10

20

30

40

50

60

GND-CONNECTED SWITCH

BAT-CONNECTED SWITCH

WETTING CURRENT PULSE

(NORMAL MODE, WTOFF = 0, WEN = WEND = 1)

MAX13036 toc03

20ms/div

V

IN_

10V/div

I

IN_

20mA/div

INT

2V/div

BAT CURRENT vs. TEMPERATURE

(NORMAL MODE)

TEMPERATURE (°C)

I

BAT

(μA)

MAX13036 toc04

-40 -25 -10 5 20 35 50 65 80 95 110 125

0

10

20

30

40

50

60

70

80

90

100

ADJUSTABLE HYSTERESIS OFF

ADJUSTABLE HYSTERESIS ON

BAT CURRENT vs. TEMPERATURE

(SHUTDOWN MODE)

TEMPERATURE (°C)

I

BAT

(μA)

MAX13036 toc05

-40 -25 -10 5 20 35 50 65 80 95 110 125

0

1

2

3

4

5

SD = LOW

BAT CURRENT vs. TEMPERATURE

(SCAN MODE)

TEMPERATURE (°C)

I

BAT

(μA)

MAX13036 toc06

-40 -25 -10 5 20 35 50 65 80 95 110 125

0

5

10

15

20

25

30

SCANNING PERIOD = 64ms

SCANNING PERIOD = 2ms

TYPICAL IN0 DRIVING

(NORMAL MODE, WTOFF = WEN = WEND = 0)

MAX13036 toc07

40μs/div

V

IN0

5V/div

V

DO0

2V/div

f = 5kHz

TYPICAL IN0 DRIVING

(NORMAL MODE, WTOFF = WEN = WEND = 0)

MAX13036 toc08

2ms/div

V

IN0

5V/div

V

DO0

2V/div

f = 100Hz
ADJUSTABLE HYSTERESIS OFF

HYSTERESIS vs. R

HYST

R

(Ω)

HYSTERESIS (V)

MAX13036 toc09

0 200k 400k 600k 800k 1M

0

1

2

3

4

5

6

7

8

ADJUSTABLE HYSTERESIS ON