WT60P1 Просмотр технического описания (PDF) - Weltrend Semiconductor
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WT60P1 Datasheet PDF : 24 Pages
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PWM D/A Converter
WT60P1
Digital Monitor Controller
Ver. 1.51 Jul-31-1998
The WT6018 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 R/W
0000H R/W
0001H R/W
0002H R/W
0003H R/W
0004H R/W
0005H R/W
0006H R/W
0007H R/W
0008H R/W
0009H R/W
000AH R/W
000BH R/W
000CH R/W
000DH R/W
Initial
80H
80H
80H
80H
80H
80H
80H
80H
80H
80H
80H
80H
80H
80H
Bit7
DA07
DA17
DA27
DA37
DA47
DA57
DA67
DA77
DA87
DA97
DA107
DA117
DA127
DA137
Bit6
DA06
DA16
DA26
DA36
DA46
DA56
DA66
DA76
DA86
DA96
DA106
DA116
DA126
DA136
Bit5
DA05
DA15
DA25
DA35
DA45
DA55
DA65
DA75
DA85
DA95
DA105
DA115
DA125
DA135
Bit4
DA04
DA14
DA24
DA34
DA44
DA54
DA64
DA74
DA84
DA94
DA104
DA114
DA124
DA134
Bit3
DA03
DA13
DA23
DA33
DA43
DA53
DA63
DA73
DA83
DA93
DA103
DA113
DA123
DA133
Bit2
DA02
DA12
DA22
DA32
DA42
DA52
DA62
DA72
DA82
DA92
DA102
DA112
DA122
DA132
Bit1
DA01
DA11
DA21
DA31
DA41
DA51
DA61
DA71
DA81
DA91
DA101
DA111
DA121
DA131
Bit0
DA00
DA10
DA20
DA30
DA40
DA50
DA60
DA70
DA80
DA90
DA100
DA110
DA120
DA130
Bit Name
DAx7-DAx0
01H : 1/256 duty cycle
02H : 2/256 duty cycle
03H : 3/256 duty cycle
:
FFH : 255/256 duty cycle
Bit value
**Do not write 00H to the PWM registers. This will cause unstable
output.
Weltrend Semiconductor, Inc.
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