MLX81150 Datasheet, PDF (16/23 Pages) Melexis Microelectronic Systems – LIN-Slave for relay and DC motor control

MLX81150
LIN-Slave for relay and DC motor control
4.8 Key inputs with different wetting currents in active and sleep configuration
Depending on different application requests for the key inputs it might be necessary to use in active mode
relatively high wetting currents for the external switches. These currents will be provided by external pull up /
pull down resistors. The IC will read the switches then with suitable threshold levels.
In SLEEP MODE relatively low wetting currents might be necessary. These currents will also be provided by
external pull up / pull down resistors. Wake up will be then just with a rising or falling edge of the incoming
signal. An external bipolar transistor will just select the suitable series resistor for active mode or sleep mode.
VBAT
VS
RTG
VDDA
VDDD
GNDCAP
AD1
KEY0
KEY1
KEY2
KEY3
KEY4
KEY5
KEY6
KEY7
PWM1
Figure 9 – Principle application diagram using different wetting currents in active and sleep mode
configuration, switches are related to GND; PWM1 pin provides steady state voltage level, pull up
currents
MLX81150 – Product abstract
Page 16 of 23
TFR / 02.08.2013
Rev 015