MC33993 Overview
ARCHIVE INFORMATION ARCHIVE INFORMATION Freescale Semiconductor Advance Information Multiple Switch Detection Interface Document Number: 6, 5/2008 33993 The 33993 Multiple Switch Detection Interface is designed to detect the closing and opening of up to 22 switch contacts. The switch status, either open or closed, is transferred to the microprocessor unit (MCU) through a serial peripheral interface (SPI).
MC33993 Key Features
- Designed to Operate 5.5 V ≤ VPWR ≤ 26 V
- Switch Input Voltage Range -14 V to VPWR, 40 V Max
- Interfaces Directly to Microprocessor Using 3.3 V/5.0 V SPI
- Selectable Wake-Up on Change of State
- 40°C to 125°C
- Selectable Wetting Current (16 mA or 2.0 mA)
- 8 Programmable Inputs (Switches to Battery or Ground)
- 14 Switch-to-Ground Inputs
- VPWR Standby Current 100 μA Typical, VDD Standby Current 20 μA Typical
- Active Interrupt (INT) on Change-of-Switch State