参数资料
型号: PIC16C72A-04E/SS
厂商: Microchip Technology
文件页数: 70/120页
文件大小: 0K
描述: IC MCU OTP 2KX14 A/D PWM 28SSOP
产品培训模块: Asynchronous Stimulus
标准包装: 47
系列: PIC® 16C
核心处理器: PIC
芯体尺寸: 8-位
速度: 4MHz
连通性: I²C,SPI
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 22
程序存储器容量: 3.5KB(2K x 14)
程序存储器类型: OTP
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 4 V ~ 5.5 V
数据转换器: A/D 5x8b
振荡器型: 外部
工作温度: -40°C ~ 125°C
封装/外壳: 28-SSOP(0.209",5.30mm 宽)
包装: 管件
配用: 309-1025-ND - ADAPTER 28-SSOP TO 28-DIP
PIC16C62B/72A
1999 Microchip Technology Inc.
Preliminary
DS35008B-page 53
9.2
Selecting the A/D Conversion Clock
The A/D conversion time per bit is defined as TAD. The
A/D conversion requires 9.5TAD per 8-bit conversion.
The source of the A/D conversion clock is software
selectable. The four possible options for TAD are:
2TOSC
8TOSC
32TOSC
Internal RC oscillator
For correct A/D conversions, the A/D conversion clock
(TAD) must be selected to ensure a minimum TAD time
of 1.6
s.
The A/D module can operate during sleep mode, but
the RC oscillator must be selected as the A/D clock
source prior to the SLEEP instruction.
Table 9-1 shows the resultant TAD times derived from
the device operating frequencies and the A/D clock
source selected.
9.3
Configuring Analog Port Pins
The ADCON1 and TRISA registers control the opera-
tion of the A/D port pins. The port pins that are desired
as analog inputs must have their corresponding TRIS
bits set (input). If the TRIS bit is cleared (output), the
digital output level (VOH or VOL) will be converted.
The A/D operation is independent of the state of the
CHS2:CHS0 bits and the TRIS bits.
TABLE 9-1
TAD vs. DEVICE OPERATING FREQUENCIES
Note 1: When reading the port register, all pins
configured as analog input channels will
read as cleared (a low level). Pins config-
ured as digital inputs, will convert an ana-
log input. Analog levels on a digitally
configured input will not affect the conver-
sion accuracy.
Note 2: Analog levels on any pin that is defined as
a digital input (including the AN4:AN0
pins) may cause the input buffer to con-
sume current that is out of the devices
specification.
AD Clock Source (TAD)
Device Frequency
Operation
ADCS1:ADCS0
20 MHz
5 MHz
1.25 MHz
333.33 kHz
2TOSC
00
100 ns(2)
400 ns(2)
1.6
s6 s
8TOSC
01
400 ns(2)
1.6
s6.4 s
24
s(3)
32TOSC
10
1.6
s6.4 s
25.6
s(3)
96
s(3)
RC(5)
11
2 - 6
s(1,4)
2 - 6
s(1,4)
2 - 6
s(1,4)
2 - 6
s(1)
Legend: Shaded cells are outside of recommended range.
Note 1: The RC source has a typical TAD time of 4
s.
2: These values violate the minimum required TAD time.
3: For faster conversion times, the selection of another clock source is recommended.
4: When device frequency is greater than 1 MHz, the RC A/D conversion clock source is recommended for
sleep operation only.
5: For extended voltage devices (LC), please refer to Electrical Specifications section.
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