参数资料
型号: PIC14000T-20/SS
厂商: Microchip Technology
文件页数: 112/153页
文件大小: 0K
描述: IC MCU OTP 4KX14 A/D 28SSOP
标准包装: 2,100
系列: PIC® 14
核心处理器: PIC
芯体尺寸: 8-位
速度: 20MHz
连通性: I²C
外围设备: POR,温度传感器,WDT
输入/输出数: 20
程序存储器容量: 7KB(4K x 14)
程序存储器类型: OTP
RAM 容量: 192 x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 6 V
数据转换器: 斜率 A/D
振荡器型: 内部
工作温度: 0°C ~ 70°C
封装/外壳: 28-SSOP(0.209",5.30mm 宽)
包装: 带卷 (TR)
1996 Microchip Technology Inc.
Preliminary
DS40122B-page 61
PIC14000
8.6
Programmable Current Source
Four conguration 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
A (nominal) in 2.25 A
increments. The intermediate values of the current
source are as follows:
TABLE 8-2:
PROGRAMMABLE CURRENT
SOURCE SELECTION
ADCON1<7:4>
Current Source
Output
0000
OFF - all current
sources disabled
0001
2.25
A
0010
4.5
A
0011
6.75
A
0100
9
A
0101
11.25
A
0110
13.5
A
0111
15.75
A
1000
18
A
1001
20.25
A
1010
22.5
A
1011
24.75
A
1100
27
A
1101
29.25
A
1110
31.5
A
1111
33.75
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-coefcient as found in teon, 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
s to allow a complete discharge.
Asserting ADRST disables the current sources inter-
nally. Current ow begins when ADRST is cleared.
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