参数资料
型号: PIC14000T-20/SS
厂商: Microchip Technology
文件页数: 115/153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)
PIC14000
DS40122B-page 64
Preliminary
1996 Microchip Technology Inc.
8.8
A/D Speed, Resolution and Capacitor
Selection
The conversion time for the A/D converter on the
PIC14000 can be calculated using the equation:
Conversion Time = (1/Fosc) x 2N
Where Fosc is the oscillator frequency and N is the
number of bits of resolution desired.
Therefore at 4MHz, the conversion time for 16 bits is
16.384 msec. Conversely, it is 256
sec for 10 bits.
Choosing the correct ramp capacitor for the CDAC pin
is required to achieve the desired resolution, conver-
sion time and full scale input voltage. The equation for
selecting the ramp capacitor value is:
Capacitor = (conversion time in seconds) X
(current source output in amps) / (full scale in volts)
Table 8-6 provides example capacitor values for the
desired A/D resolution, conversion time, and full scale
voltage measurement.
TABLE 8-6:
CDAC CAPACITOR SELECTION (EXAMPLES FOR FULL SCALE OF 3.5V AND 1.5V)
A/D
Resolution
(Bits)
Conversion Time
(Seconds)
Full Scale
(Volts)
A/D Current
Source Output
(
amps)
Calculated
CDAC
Capacitor
(Farads)
CDAC Capacitor
Nearest Standard
Value
16
0.016384
3.5
24.75
1.17E-07
.1uF
14
0.004096
3.5
24.75
2.93E-08
.022uF
12
0.001024
3.5
24.75
7.31E-09
6800pF
16
0.016384
1.5
24.75
2.73E-07
0.22
F
14
0.004096
1.5
24.75
6.83E-08
68nF
12
0.001024
1.5
24.75
1.71E-08
15nF
Note: Assumes FOSC of 4 MHz.
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