MAX13037 Datasheet, PDF (9/22 Pages) Maxim Integrated Products – Automotive Contact Monitor and Level Shifters with LDO Regulator

Automotive Contact Monitor and
Level Shifters with LDO Regulator
Typical Operating Characteristics (continued)
(BAT = +14V, SD = V_BAT, R_WET = 61kΩ, R_HYST = 90kΩ, C_TDEB = 4700pF, C_TD = 4700pF, T_A = +25°C, unless otherwise noted.)
V_LO TRANSIENT LOAD REGULATION
WATCHDOG INTERRUPT AND RESET
PERIOD vs. TEMPERATURE
100
WATCHDOG INTERRUPT AND RESET
PERIOD vs. C_TD
150
90
125
I_LO
50mA/div
100
80
75
V_LO
70
(AC-COUPLED)
50
50mV/div
60
25
PIN
1, 15, 31
2
3
4
5
6
7
8
9
10, 11, 34
12
13
14
16
17
18
1ms/div
50
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
0
0 2000 4000 6000 8000 10,000
C_TD (pF)
Pin Description
NAME
GND
IN0
IN1
IN2
IN3
IN4
IN5
IN6
IN7
N.C.
HYST
WET
TDEB
OT
INT
TD
Ground
FUNCTION
Switch Input Channel 0. Connect IN0 to a switch connected to GND. IN0 can be programmed as a
direct input with a level-shifted output on DO0 (see the Mechanical Switch Inputs (IN0–IN7) section).
Switch Input Channel 1. Connect IN1 to a switch connected to GND. IN1 can be programmed as a
direct input with a level-shifted output on DO1 (see the Mechanical Switch Inputs (IN0–IN7) section).
Switch Input Channel 2. Connect IN2 to a switch connected to GND.
Switch Input Channel 3. Connect IN3 to a switch connected to GND.
Switch Input Channel 4. Connect IN4 to a switch connected to GND or BAT.
Switch Input Channel 5. Connect IN5 to a switch connected to GND or BAT.
Switch Input Channel 6. Connect IN6 to a switch connected to GND or BAT.
Switch Input Channel 7. Connect IN7 to a switch connected to GND or BAT.
No Connection. Not internally connected.
Hysteresis Input. Connect HYST to GND with a 0Ω to 900kΩ resistor to set the input voltage
hysteresis on IN0–IN7.
Wetting Current Input. Connect a 30kΩ to 330kΩ resistor from WET to GND to set the wetting current
on IN0–IN7.
Switch Debounce Time Input. Connect a 500pF to 10nF capacitor from TDEB to GND to set the
switch debounce time.
Overtemperature Warning Output. OT is an open-drain output that asserts low when the thermal
warning threshold is exceeded.
Interrupt Output. INT is an open-drain output that asserts low when one or more of the IN0–IN7 inputs
change state and are enabled for interrupts or when the watchdog times out.
Reset and Watchdog Timeout Input. Connect TD to GND with a 500pF to 10nF capacitor to set the
timeout period for the reset and watchdog.
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