AN2623 Freescale Semiconductor / Motorola, AN2623 Datasheet - Page 4

• Manufacturer Part Number: AN2623
• Description: LIN Temperature Sensor Using the MC68HC908QY/QY MCU
• Manufacturer: Freescale Semiconductor / Motorola

AN2623/D
4
Vsupp
LIN
GND
Figure 1. Simple Temperature Sensor Model Circuit Diagram
IN4001
LIN Temperature Sensor Using the MC68HC908QT/QY MCU
As can be seen in
lower the power consumption. This is because driving it at logic low turns off
the MAX6611 internal circuit, which reduces the supply current to 1 µA.
In this application, the AD2 and AD3 A/D channels connect the temperature
sensor to the MCU because the other A/D converter pins are used in the LINkits
evaluation board to attach the RS-232 and LIN interfaces.
2K2
6
3
10k
Freescale Semiconductor, Inc.
LIN
Wake
MC33399
For More Information On This Product,
8
5
IN
SHDN
LT1121
EN
RX
TX
OUT
Go to: www.freescale.com
2
1
4
Pin Number
1
3
1
Figure
SHDN
Vcc
3
4
5
MAX6611
Table 3. MAX6611 Pin Description
TEMP
Ref
1, the SHDN input is not used, but it can be used to
5
4
1nF
SHDN
TEMP
Name
REF
47k
1nF
12
11
13
2
4
5
8
PTB7
PTA1/AD1/TCH1
PTB2
PTA0/AD0/TCH0
PTA5/OSC1
PTA4/OSC2
PTA3/RST
Logical shutdown input
Temperature output
Reference voltage output
MC68HC908QY
MC68HC908QY
PTA2/IRQ
Function
PTB0
PTB1
PTB3
PTB4
PTB5
PTB6
15
14
10
7
6
3
9
2
2
2
2
100k
1
1
1
1
1
1
1
1
1
S1
1k
1k
1k
1k
MOTOROLA
3
2
2
2
2