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参数资料
型号： PIC14000-20/SO
厂商： Microchip Technology
文件页数： 116/153页
文件大小： 0K
描述： IC MCU OTP 4KX14 A/D 28SOIC
产品培训模块： Asynchronous Stimulus
标准包装： 27
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-SOIC（0.295"，7.50mm 宽）
包装： 管件
1996 Microchip Technology Inc.
Preliminary
DS40122B-page 65
PIC14000
9.0
OTHER ANALOG MODULES
The PIC14000 has additional analog modules for
mixed signal applications. These include:
bandgap voltage reference
comparators with programmable references
internal temperature sensor
voltage regulator control
9.1
Bandgap Voltage Reference
The bandgap reference circuit is used to generate a
1.2V nominal stable voltage reference for the A/D and
the low-voltage detector. The bandgap reference is
channel 4 of the analog mux. The bandgap reference
voltage is stored in the calibration space EPROM
(See Table 4-2). To enable the bandgap reference
REFOFF (SLPCON<5>) must be cleared.
9.2
Level-Shift Networks
The RA1/AN1 and RA5/AN5 pins have an internal
level-shift network. A current source and resistor are
used to bias the pin voltage by about +0.5V into a range
usable by the A/D converter. The nominal value of bias
current source is 5
A and the resistor is 100 kohms.
The level-shift function can be turned on by clearing the
LSOFF bit (SLPCON<4>) to '0'.
Note:
The minimum voltage permissible at the
RA1/AN1 and RA5/AN5 pins is -0.3V. The
input protection diodes will begin to turn
on beyond -0.3V, introducing signicant
errors in the A/D readings. Under no con-
ditions should the pin voltage fall below
-0.5V.
9.2.1
ZEROING/FILTERING SWITCHES
The RA1/AN1 and RA5/AN5 inputs also have a
matched pair of pass gates useful for current-measure-
ment applications. One gate is connected between the
pin and the level-shift network. The second pass gate
is connected to ground as shown in Figure 9-1. By set-
ting the ADZERO bit (ADCON0<0>), a zero-current
condition is simulated. Subsequent A/D readings are
calculated relative to this zero count from the A/D. This
zeroing of the current provides very high accuracies at
low current values where it is most needed.
For additional noise ltering or for capturing short dura-
tion periodic pulses, an optional lter capacitor may be
connected from the SUM pin to ground (this feature is
available for RA1/AN1 only). This forms an RC network
with the internal 100 kohm (nominal) bias resistor to act
as a low pass lter. The capacitor size can be adjusted
for the desired time constant.
A switch is included between the output from the
RA1/AN1 level-shift network and the SUM pin. This
switch is closed during A/D sampling periods and is
automatically opened during a zeroing operation (if
ADZERO = '1'). If not required in the system, this pin
should be left oating (not connected).
Setting the LSOFF bit (SLPCON<4>) disables the
level-shift networks, so the RA1/AN1 and RA5/AN5
pins can continue to be used as general-purpose ana-
log inputs.
This document was created with FrameMaker404
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PIC14000T-04/SO 功能描述:8位微控制器 -MCU 7KB 192 RAM 20 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC14000T-04/SS 功能描述:8位微控制器 -MCU 7KB 192 RAM 20 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC14000T-04I/SO 功能描述:8位微控制器 -MCU 7KB 192 RAM 20 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC14000T-04I/SS 功能描述:8位微控制器 -MCU 7KB 192 RAM 20 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC14000T-20/SO 功能描述:8位微控制器 -MCU 7KB 192 RAM 20 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
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