The A/D conversion time per bit is d" />
參數(shù)資料
型號： AT90S8535-8JI
廠商： Atmel
文件頁數(shù)： 64/127頁
文件大小： 0K
描述： IC MCU 8K 8MHZ A/D IT 44PLCC
標準包裝： 27
系列： AVR® 90S
核心處理器： AVR
芯體尺寸： 8-位
速度： 8MHz
連通性： SPI，UART/USART
外圍設(shè)備： 欠壓檢測/復位，POR，PWM，WDT
輸入/輸出數(shù)： 32
程序存儲器容量： 8KB（4K x 16）
程序存儲器類型： 閃存
EEPROM 大小： 512 x 8
RAM 容量： 512 x 8
電壓 - 電源 (Vcc/Vdd)： 4 V ~ 6 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 8x10b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 44-LCC（J 形引線）
包裝： 管件
1997 Microchip Technology Inc.
DS30272A-page 41
PIC16C71X
7.2
Selecting the A/D Conversion Clock
The A/D conversion time per bit is dened 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:
2.0
s for the PIC16C71
1.6
s for all other PIC16C71X devices
Table 7-1 and Table 7-2 and show the resultant TAD
times derived from the device operating frequencies
and the A/D clock source selected.
7.3
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.
Note 1: When reading the port register, all pins
congured as analog input channels will
read as cleared (a low level). Pins cong-
ured as digital inputs, will convert an ana-
log input. Analog levels on a digitally
congured input will not affect the conver-
sion accuracy.
Note 2: Analog levels on any pin that is dened as
a digital input (including the AN7:AN0
pins), may cause the input buffer to con-
sume current that is out of the devices
specication.
TABLE 7-1:
TAD vs. DEVICE OPERATING FREQUENCIES, PIC16C71
TABLE 7-2:
TAD vs. DEVICE OPERATING FREQUENCIES, PIC16C710/711, PIC16C715
AD Clock Source (TAD)
Device Frequency
Operation
ADCS1:ADCS0
20 MHz
16 MHz
4 MHz
1 MHz
333.33 kHz
2TOSC
00
100 ns(2)
125 ns(2)
500 ns(2)
2.0
s
6
s
8TOSC
01
400 ns(2)
500 ns(2)
2.0
s
8.0
s
24
s(3)
32TOSC
10
1.6
s(2)
2.0
s
8.0
s
32.0
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)
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 Specications section.
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
s
6
s
8TOSC
01
400 ns(2)
1.6
s
6.4
s
24
s(3)
32TOSC
10
1.6
s
6.4
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 Specications section.
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