Document Number: MC33784 Freescale Semiconductor Rev 3.0, 11/2009 Advance Information DSI 2.02 Sensor Interface 33784 The 33784 is a slave, Distributed System Interface Bus (DBUS), version 2.02 compatible device, optimized as a sensor interface. The device contains circuits to power sensors such as accelerometers, and to digitize the analog level from the sensor. The device is controlled by commands over the bus, and returns measured data SENSOR INTERFACE and other information over the bus. Features DSI version 2.02 compatible 2-channel, 10-bit analog-to-digital converter (ADC) 3 pins configurable as logic inputs or outputs Provides regulated +5.0v output for sensor power from bus On-board clock (no external elements required) EF SUFFIX (PB-FREE) Includes bus switches on bus and bus return 98ASB42566B Pb-free packaging designated by suffix code EF 16-LEAD SOICN ORDERING INFORMATION Temperature Device Package Range (T ) A MCZ33784EF/R2 - 40C to 125C 16 SOICN 33781 33784 33784 BUS REGOUT BUSOUT BUSIN BUSOUT To other 33784 RTNIN RTNOUT Slaves RTNIN RTNOUT AGND BUSIN AN0 AN1 H CAP I/O0 IDDQ I/O1 TEST1 I/O2 TOUT TEST2 V CC XY ACCELEROMETER AGND Figure 1. 33784 Simplified Application Diagram (Daisy Chain Shown) * This document contains certain information on a new product. Specifications and information herein are subject to change without notice. Freescale Semiconductor, Inc., 2008 - 2009. All rights reserved.INTERNAL BLOCK DIAGRAM INTE RNAL BLOCK DIAGRAM H CAP 2.2F or Rectifier 4.7F Typical BUSIN BUSOUT High Side Bus Switch 0-35 V Receiver Data Response Current 011mA Frame 8.0mA/s Received Message Bandgap from MCU Bus Return Reference Oscillator Logic 10MHz TOUT Command Decode State Machine DataOut <2.0> Response Generation I/O Buffers DataOut <0> Power REGOUT Management I/O0 5.0V Regulator DataOut <1> C = 2.2F RO BG Reference Bias Currents I/O1 AGND SEL DataOut <2> I/O2 POR IDDQ 10-Bit TEST1 ADC TEST2 MUX AN0 AN1 Low Side Bus Switch RTNIN RTNOUT Figure 2. 33784 Simplified Internal Block Diagram 33784 Analog Integrated Circuit Device Data 2 Freescale Semiconductor