WT6014
Digital Monitor Controller
Ver. 1.21 Jul-31-1998
PWM D/A Converter
The WT6014 provides 14 PWM D/A converters. DA0 to DA7 are open-drain outputs and external
applied voltage on these pins can be up to 10 volts. DA8 to DA13 are 5 volts push-pull CMOS outputs
and are shared with I/O Port PA0 to PA5. All D/A converters are 62.5kHz frequency with 8-bit
resolution. Each D/A converter is controlled by the corresponding register (REG#00H to REG#0DH),
the duty cycle can be programmed from 1/256 (data = 01H) to 255/256 (data = FFH).
Duty cycle = 1/256
62.5ns
Duty cycle = 2/256
125ns
62.5ns
Duty cycle = 255/256
1/62.5kHz=16us
To program the PWM D/A converters, write the corresponding registers ( REG#00H to REG#0DH).
Address
0000H
0001H
0002H
0003H
0004H
0005H
0006H
0007H
0008H
0009H
000AH
000BH
000CH
000DH
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial
80H
80H
80H
80H
80H
80H
80H
80H
80H
80H
80H
80H
80H
80H
Bit7
DA0
7
DA1
7
DA2
7
DA3
7
DA4
7
DA5
7
DA6
7
DA7
7
DA8
7
DA9
7
DA10
7
DA11
7
DA12
7
DA13
7
Bit6
DA0
6
DA1
6
DA2
6
DA3
6
DA4
6
DA5
6
DA6
6
DA7
6
DA8
6
DA9
6
DA10
6
DA11
6
DA12
6
DA13
6
Bit5
DA0
5
DA1
5
DA2
5
DA3
5
DA4
5
DA5
5
DA6
5
DA7
5
DA8
5
DA9
5
DA10
5
DA11
5
DA12
5
DA13
5
Bit4
DA0
4
DA1
4
DA2
4
DA3
4
DA4
4
DA5
4
DA6
4
DA7
4
DA8
4
DA9
4
DA10
4
DA11
4
DA12
4
DA13
4
Bit3
DA0
3
DA1
3
DA2
3
DA3
3
DA4
3
DA5
3
DA6
3
DA7
3
DA8
3
DA9
3
DA10
3
DA11
3
DA12
3
DA13
3
Bit2
DA0
2
DA1
2
DA2
2
DA3
2
DA4
2
DA5
2
DA6
2
DA7
2
DA8
2
DA9
2
DA10
2
DA11
2
DA12
2
DA13
2
Bit1
DA0
1
DA1
1
DA2
1
DA3
1
DA4
1
DA5
1
DA6
1
DA7
1
DA8
1
DA9
1
DA10
1
DA11
1
DA12
1
DA13
1
Bit0
DA0
0
DA1
0
DA2
0
DA3
0
DA4
0
DA5
0
DA6
0
DA7
0
DA8
0
DA9
0
DA10
0
DA11
0
DA12
0
DA13
0
Bit Name
DAx7-DAx0
Bit value
01H : 1/256 duty cycle
02H : 2/256 duty cycle
03H : 3/256 duty cycle
:
FFH : 255/256 duty cycle
** Do not write 00H to the PWM registers. This will cause unstable
output on the corresponding pin.
Weltrend Semiconductor, Inc.
4
WELTREND [ WELTREND SEMICONDUCTOR ]
