The A/D conversion time per bit " />
參數(shù)資料
型號: PIC16C716-04I/P
廠商: Microchip Technology
文件頁數(shù): 54/106頁
文件大?。?/td> 0K
描述: IC MCU OTP 2KX14 A/D PWM 18DIP
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝: 25
系列: PIC® 16C
核心處理器: PIC
芯體尺寸: 8-位
速度: 4MHz
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 13
程序存儲器容量: 3.5KB(2K x 14)
程序存儲器類型: OTP
RAM 容量: 128 x 8
電壓 - 電源 (Vcc/Vdd): 4 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 4x8b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 18-DIP(0.300",7.62mm)
包裝: 管件
配用: ISPICR1-ND - ADAPTER IN-CIRCUIT PROGRAMMING
309-1059-ND - ADAPTER 18 ZIF BD W/18SO PLUGS
DVA16XP180-ND - ADAPTER DEVICE FOR MPLAB-ICE
AC164010-ND - MODULE SKT PROMATEII DIP/SOIC
2005 Microchip Technology Inc.
DS41106B-page 49
PIC16C712/716
8.2
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
μs.
Table 8-1 shows the resultant TAD times derived from
the device operating frequencies and the A/D clock
source selected.
8.3
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 8-1:
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
configured as digital inputs, will convert
an analog input. Analog levels on a
digitally configured input will not affect the
conversion accuracy.
2: Analog levels on any pin that is defined as
a digital input (including the AN3:AN0
pins), may cause the input buffer to
consume 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
μs6 μs
8TOSC
01
400 ns(2)
1.6
μs6.4 μs
24
μs(3)
32TOSC
10
1.6
μs6.4 μs
25.6
μs(3)
96
μs(3)
RC(5)
11
2-6
μs(1,4)
2-6
μs(1,4)
2-6
μs(1,4)
2-6
μs(1)
Legend: Shaded cells are outside of recommended range.
Note 1: The RC source has a typical TAD time of 4
μs.
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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