User's Manual

© SENSITECH INC. CONFIDENTIAL – CONTROLLED DOCUMENT Page 69 of 83
A Carrier Corp. Company
PART NUMBER T82002163
REV A
TT4 Optical Interface Circuit
The circuit consists of a NAND gate IC which inverts the TX signal (input).
The input UP_UARTC_TX (B) is High and the input (A) is High, then the output is Low and the LED
will not conduct. However, when the TX line transitions from a High to Low state, then the NAND
gate output is High which the LED will begin to conduct.
The UP_UARTC_RX line is Low when light turns the Phototransistor ON. However, when there is no
light, the Phototransistor is OFF; therefore, the UP_UARTC_RX line is High.
LCD
The Trip Strip II will incorporate a monochrome FSTN 320 x 240 Transflective LCD display which will
allow the user to display the temperature/humidity graph of a downloaded monitor.
EDT LCD
LogicPD Evaluation
Board (J11)
VDD
1 4
3.3V
VSS
2 1
DGND
VLCD
3 Booster Power Supply
VLCD (boost/pot output)
FLM
4 28
LCD_VSYNC
n/c
5 n/c
CL1
6 30
LCD_HSYNC
CL2
7 32
LCD_DCLK
D0
8 26
B4
D1
9 24
B3
D2
10 23
B2
D3
11 22
B1
DISPOFF
12 35
LCD_MDISP
VLED
13 3
5V
VLSS
14 1
DGND