参数资料
型号: PIC14000T-20/SS
厂商: Microchip Technology
文件页数: 111/153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 60
Preliminary
1996 Microchip Technology Inc.
8.4
A/D Comparator
The PIC14000 includes a high gain comparator for
A/D conversions. The positive input terminal of the A/D
comparator is connected to the output of an analog
mux through an RC low-pass lter. The nominal
time-constant for the RC lter is 3.5
s. The negative
input terminal is connected to the external 0.1
F (nom-
inal) ramp capacitor.
8.5
Analog Mux
A total of 16 channels are internally multiplexed to the
single
A/D
comparator
positive
input.
Four
conguration bits (ADCON0<7:4>) select the channel
to be converted. Refer to Table 8-1 for channel assign-
ments.
TABLE 8-1:
A/D CHANNEL ASSIGNMENT
ADCON0(7:4)
A/D Channel
0000
RA0/AN0 pin
0001
RA1/AN1 pin
0010
RA2/AN2 pin
0011
RA3/AN3 pin
0100
Bandgap reference voltage
0101
Slope reference SREFHI
0110
Slope reference SREFLO
0111
Internal temperature sensor
1000
Programmable reference A output
1001
Programmable reference B output
1010
RD4/AN4 pin
1011
RD5/AN5 pin
1100
RD6/AN6 pin
1101
RD7/AN7 pin
1110
Reserved
1111
Reserved
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