參數(shù)資料
型號: PIC14000-04
廠商: Microchip Technology Inc.
英文描述: 28-Pin Programmable Mixed Signal Controller
中文描述: 28引腳可編程混合信號控制器
文件頁數(shù): 61/152頁
文件大?。?/td> 953K
代理商: PIC14000-04
1996 Microchip Technology Inc.
Preliminary
DS40122B-page 61
PIC14000
8.6
Programmable Current Source
Four configuration bits (ADCON1<7:4>) are used to
control a programmable current source for generating
the ramp voltage to the A/D comparator. It allows com-
pensation for full-scale input voltage, clock frequency
and CDAC capacitor tolerance variations. The current
values range from 0 to 33.75
increments. The intermediate values of the current
source are as follows:
μ
A (nominal) in 2.25
μ
A
TABLE 8-2:
PROGRAMMABLE CURRENT
SOURCE SELECTION
ADCON1<7:4>
Current Source
Output
0
0
0
0
OFF - all current
sources disabled
0
0
0
1
2.25
μ
A
0
0
1
0
4.5
μ
A
0
0
1
1
6.75
μ
A
0
1
0
0
9
μ
A
0
1
0
1
11.25
μ
A
0
1
1
0
13.5
μ
A
0
1
1
1
15.75
μ
A
1
0
0
0
18
μ
A
1
0
0
1
20.25
μ
A
1
0
1
0
22.5
μ
A
1
0
1
1
24.75
μ
A
1
1
0
0
27
μ
A
1
1
0
1
29.25
μ
A
1
1
1
0
31.5
μ
A
1
1
1
1
33.75
μ
A
The programmable current source output is tied to the
CDAC pin and is used to charge an external capacitor
to generate the ramp voltage for the A/D comparator.
(Refer to Figure 8-1.) This capacitor should have a low
voltage-coefficient as found in teflon, polypropylene, or
polystyrene capacitors, for optimum results. The
capacitor must be discharged at the beginning of each
conversion cycle by asserting ADRST (ADCON0<1>)
for at least 200
μ
s to allow a complete discharge.
Asserting ADRST disables the current sources inter-
nally. Current flow begins when ADRST is cleared.
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