Reference guide

Introduction
Cluster (Dashboard) Using S12HZ256 as a Single-Chip Solution Designer Reference Manual, Rev. 0
8 Freescale Semiconductor
1.2 System Overview
Figure 1-1 provides a pictorial overview of the system.
Figure 1-1. S12HZ256 Dashboard System
Vehicle Speed
CAN Physical
Interface
PWM
Gauge
Drivers
LED
CAN
5V Vcc
PWM
Input
Signal
Cond’n
(as req’d)
LM2902
MC33174
MC33184
TL064
Engine RPM
Engine Temp.
Batt. Voltage
Fuel Level
I/C0
I/C1
ADC5
ADC4
ADC3
ADC2
Vreg
*
Vreg
*
I / O
LCD
DRIVER
MC9S12Hx
16 Bit MCU
• Integrated LCD Driver
• 32x4 (112 QFP package)
• Integrated Drive for 4 Stepper Motors
With Motor Stall Detection (MSD)
(16 hi-current PWM outputs)
• Easier PCB Routing
• Fewer Components
• Higher Reliability
• Cost Effective
Keys
RS232
SCI