參數(shù)資料
型號： AT90S8535-8PI
廠商： Atmel
文件頁數(shù)： 66/127頁
文件大?。?/td> 0K
描述： IC MCU 8K FLSH 8MHZ A/D IT 40DIP
標(biāo)準(zhǔn)包裝： 18
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(fù)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?。?/td> 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： 40-DIP（0.600"，15.24mm）
包裝： 管件
1997 Microchip Technology Inc.
DS30272A-page 43
PIC16C71X
7.4.1
FASTER CONVERSION - LOWER
RESOLUTION TRADE-OFF
Not all applications require a result with 8-bits of reso-
lution, but may instead require a faster conversion time.
The A/D module allows users to make the trade-off of
conversion speed to resolution. Regardless of the res-
olution required, the acquisition time is the same. To
speed up the conversion, the clock source of the A/D
module may be switched so that the TAD time violates
the minimum specied time (see the applicable electri-
cal specication). Once the TAD time violates the mini-
mum specied time, all the following A/D result bits are
not valid (see A/D Conversion Timing in the Electrical
Specications section.) The clock sources may only be
switched between the three oscillator versions (cannot
be switched from/to RC). The equation to determine
the time before the oscillator can be switched is as
follows:
Conversion time = 2TAD + N TAD + (8 - N)(2TOSC)
Where: N = number of bits of resolution required.
Since the TAD is based from the device oscillator, the
user must use some method (a timer, software loop,
etc.) to determine when the A/D oscillator may be
changed. Example 7-3 shows a comparison of time
required for a conversion with 4-bits of resolution, ver-
sus the 8-bit resolution conversion. The example is for
devices operating at 20 MHz and 16 MHz (The A/D
clock is programmed for 32TOSC), and assumes that
immediately after 6TAD, the A/D clock is programmed
for 2TOSC.
The 2TOSC violates the minimum TAD time since the
last 4-bits will not be converted to correct values.
EXAMPLE 7-3:
4-BIT vs. 8-BIT CONVERSION TIMES
Freq. (MHz)(1)
Resolution
4-bit
8-bit
TAD
20
1.6
s
1.6
s
16
2.0
s
2.0
s
TOSC
20
50 ns
16
62.5 ns
2TAD + N TAD + (8 - N)(2TOSC)
20
10
s
16
s
16
12.5
s
20
s
Note 1: The PIC16C71 has a minimum TAD time of 2.0
s.
All other PIC16C71X devices have a minimum TAD time of 1.6
s.
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