MAX13362 Datasheet, PDF (6/14 Pages) Maxim Integrated Products – 24-Channel Automotive Switch Monitor

24-Channel Automotive Switch Monitor
Typical Operating Characteristics (continued)
(V_DD = V_SD = 5V, V_VS = 14V, T_A = +25°C, unless otherwise noted.)
SWITCH THRESHOLD vs. VS VOLTAGE
(LOW-SIDE SWITCH)
3.5
SWITCH STATUS CHANGE
(POLLING MODE)
MAX13362 toc11
3.4
SWITCH OPEN TO CLOSE
3.3
3.2
SWITCH CLOSE TO OPEN
3.1
3.0
9
10 11 12 13 14 15 16 17 18
VS VOLTAGE (V)
10V
V_IN
V_INT
0V
0V
2ms/div
5V/div
2V/div
PIN
1, 2, 11,
29, 30
3
4
5
6
7
8
9
10
12
13
14
15
16, 18
17
NAME
N.C.
IN17
IN18
IN19
IN20
IN21
IN22
IN23
INT
CLK
SDO
CS
SDI
GND
V_DD
Pin Description
FUNCTION
No Connection. Not internally connected.
Switch Monitor Input Channel 17. Connect IN17 to a ground-connected switch.
Switch Monitor Input Channel 18. Connect IN18 to a ground-connected switch.
Switch Monitor Input Channel 19. Connect IN19 to a ground-connected switch.
Switch Monitor Input Channel 20. Connect IN20 to a ground-connected switch.
Switch Monitor Input Channel 21. Connect IN21 to a ground-connected switch.
Switch Monitor Input Channel 22. Connect IN22 to a ground-connected switch.
Switch Monitor Input Channel 23. Connect IN23 to a battery-connected or ground-connected switch.
When used for a battery-connected switch, add a 100Ω series protection resistor to the input.
Interrupt Output. INT is an open-drain output that asserts low when one or more of the inputs (IN0–IN23)
change state and are enabled for interrupts, or when the overtemperature threshold is exceeded.
SPI Serial Clock Input
SPI Serial Data Output. SPI data is output on SDO on the rising edges of CLK while CS is held low.
SDO is high impedance when CS is high. Connect SDO to a microcontroller data input or to a
succeeding device in a daisy chain.
SPI Chip-Select Input. Drive CS low to enable clocking of data into and out of the IC. SPI data is
latched into the device on the rising edge of CS.
SPI Serial Data Input. SPI data is latched into the internal shift register on the falling edges of CLK
while CS is held low. SDI has an internal 50kΩ pulldown resistor. Connect SDI to the SDO of a
preceding device in a daisy chain or to the microcontroller data output.
Ground. Pins 16 and 18 must be connected to ground.
Logic Supply Voltage. Connect V_DD to a 3.3V or 5V logic supply. Bypass V_DD to GND with at least a
0.1µF capacitor placed as close as possible to V_DD.
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