WT5041
8-bit
C with Heart Rate Detect Circuits
Version 1.01
Weltrend Semiconductor Inc.
2F, No. 24, Industry East 9
th
Road,
Science-Based Industrial Park,
Hsin-chu, TAIWAN
TEL: 886-3-5780241
FAX: 886-3-5770419
1
eltrend
WT5041
8-bit uC with Heart Rate Detect Circuits
REV. 1.01
March 28, 2001
WT5041
8-bit
C with Heart Rate Detect Circuits
Version 1.01
Weltrend Semiconductor Inc.
2F, No. 24, Industry East 9
th
Road,
Science-Based Industrial Park,
Hsin-chu, TAIWAN
TEL: 886-3-5780241
FAX: 886-3-5770419
2
eltrend
DESCRIPTION
The WT5041 is a high-performance, low-cost, CMOS 8-bit single-chip micro controller
with on-chip OP Amp (OPA) for heart rate detect and 128 segments LCD driver. This
chip can be used dedicate for applications where heart rate and LCD display are
required, for example sports bicycle meter, heart rate meter and heart rate watch.
This chip has 8-bit CPU, RAM, ROM, I/Os, one 16-bit timer/counters, dual 8-bit timer,
interrupt controller, three 8-bit PWM D/A output, resister to frequency converter (RFC),
heart rate detect circuits, and a LCD driver. To be suitable for portable battery-powered
applications, a power saving function is included.
FEATURES
u
8-bit single chip micro controller with 8Kbytes ROM and 256 Bytes SRAM
u
Wide voltage operating range from 2.4 V to 5.5 V
u
Built-in 32.768KHz OSC circuits.
u
14 interrupt sources, 14 halt mode release sources (warm start), 8 off mode wake
up sources (cold start); all sources have independent latches each and multi-control
is available.
u
I/O port (32 pins)
u
I/O port0 8 pins (shared with SEG25~SEG32)
u
I/O port1 1 pin (shared with OP Amp 1 pins)
u
I/O port1 3 pins (shared with PWM0~2 output)
u
I/O port1 4 pins (shared with RFC 4 pins)
u
I/O port2 8 pins (shared with key detect & event counter inputs)
u
I/O port3 6 pins (shared with OP Amp 6 pins)
u
I/O port3 2 pins (shared with BUZ/BUZB output)
u
Providing standby mode
u
Key wake up function
u
Build-in heart rate detect circuits and one 16-bit counter
u
Build-in RFC circuit and one 16-bit counter for thermistor and humidity sensor use
u
Dual 8-bit timer & one 16-bit timer/counters
WT5041
8-bit
C with Heart Rate Detect Circuits
Version 1.01
Weltrend Semiconductor Inc.
2F, No. 24, Industry East 9
th
Road,
Science-Based Industrial Park,
Hsin-chu, TAIWAN
TEL: 886-3-5780241
FAX: 886-3-5770419
3
eltrend
u
3 Channel 8-bit PWM output
u
LCD driver
u
LCD direct drive (max. 16-digit display at 1/4 duty)
u
1/4, 1/3, 1/2 duties and 1/2, 1/3 biases can be selected by software programming
u
1/4, 1/3, 1/2 duties and 1/2, 1/3 biases can be selected by software programming
u
LCD segments SEG25~32 can be used as 8 I/O pins by software programming
u
Real-time emulator
u
Package: Die form
WT5041
8-bit
C with Heart Rate Detect Circuits
Version 1.01
Weltrend Semiconductor Inc.
2F, No. 24, Industry East 9
th
Road,
Science-Based Industrial Park,
Hsin-chu, TAIWAN
TEL: 886-3-5780241
FAX: 886-3-5770419
6
eltrend
PIN FUNCTION
Name
No.
I/O
Description
COM1
1
O LCD common 1.
COM2
2
O LCD common 2.
COM3
3
O LCD common 3.
COM4
4
O LCD common 4.
SEG1
5
O LCD segment 1.
SEG2
6
O LCD segment 2.
SEG3
7
O LCD segment 3.
SEG4
8
O LCD segment 4.
SEG5
9
O LCD segment 5.
SEG6
10
O LCD segment 6.
SEG7
11
O LCD segment 7.
SEG8
12
O LCD segment 8.
SEG9
13
O LCD segment 9.
SEG10
14
O LCD segment 10.
SEG11
15
O LCD segment 11.
SEG12
16
O LCD segment 12.
SEG13
17
O LCD segment 13.
SEG14
18
O LCD segment 14.
SEG15
19
O LCD segment 15.
SEG16
20
O LCD segment 16.
SEG17
21
O LCD segment 17.
SEG18
22
O LCD segment 18.
SEG19
23
O LCD segment 19.
SEG20
24
O LCD segment 20.
SEG21
25
O LCD segment 21.
SEG22
26
O LCD segment 22.
SEG23
27
I/O LCD segment 23.
SEG24
28
I/O LCD segment 24.
P00/SEG25
29
I/O I/O port 00 or LCD segment 25.
P01/SEG26
30
I/O I/O port 01 or LCD segment 26.
P02/SEG27
31
I/O I/O port 02 or LCD segment 27.
P03/SEG28
32
I/O I/O port 03 or LCD segment 28.
P04/SEG29
33
I/O I/O port 04 or LCD segment 29.
P05/SEG30
34
I/O I/O port 05 or LCD segment 30.
P06/SEG31
35
I/O I/O port 06 or LCD segment 31.
P07/SEG32
36
I/O I/O port 07 or LCD segment 32.
P30/IN1
37
I/O I/O port 30 or OP function Input1
P31/IN2
38
I/O I/O port 31 or OP function Input2
P32/IN3
39
I/O I/O port 32 or OP function Input3
P33/O1
40
I/O I/O port 33 or OP function Output1
WT5041
8-bit
C with Heart Rate Detect Circuits
Version 1.01
Weltrend Semiconductor Inc.
2F, No. 24, Industry East 9
th
Road,
Science-Based Industrial Park,
Hsin-chu, TAIWAN
TEL: 886-3-5780241
FAX: 886-3-5770419
7
eltrend
Name
No.
I/O
Description
P34/O2
41
I/O I/O port 34 or OP function Output2
P35/O3
42
I/O I/O port 35 or OP function Output3
P36/BUZ
43
I/O I/O port 36 or BUZZER function
P37/BUZB
44
I/O I/O port 37 or BUZZERB function
P20/INT0
45
I/O I/O port 20 or INT/wake up input 0 pull high, negative edge trigger
P21/INT1
46
I/O I/O port 21 or INT/wake up input 1 pull high, negative edge trigger
P22/INT2
47
I/O I/O port 22 or INT/wake up input 2 pull high, negative edge trigger
P23/INT3
48
I/O I/O port 23 or INT/wake up input 3 pull high, negative edge trigger
P24/INT4
49
I/O I/O port 24 or INT/wake up input 4 pull high, negative edge trigger
P25/INT5
50
I/O I/O port 25 or INT/wake up input 5 pull high, negative edge trigger
P26/INT6
51
I/O I/O port 26 or INT/wake up input 6 pull high, negative edge trigger
P27/INT7/CNT
52
I/O I/O port 27 or INT/wake up input 7/counter input
GND
53
P Ground (0V).
XTAL2
54
I/O 32768Hz crystal oscillator.
XTAL1
55
I
32768Hz crystal oscillator.
P10/PWM0
56
I/O I/O port 10. or PWM0 output
P11/PWM1
57
I/O I/O port 11. or PWM1 output
P12/PWM2
58
I/O I/O port 12. or PWM2 output
P13/VR
59
I/O I/O port 13. OP reference voltage output
P14/Ra
60
I/O I/O port 14 or RFC R thermistor
P15/Rb
61
I/O I/O port 15 or RFC R humidity sensor
P16/Rs
62
I/O I/O port 16 or RFC R standard
P17/Ca
63
I/O I/O port 17 or RFC Capacitor
/RESET
64
I
Reset. Internal pull high, active low.
BIAS1
65
O LCD bias voltage 1
BIAS2
66
O LCD bias voltage 2
VDD
67
P Power supply.
PDF 
ZIP