The A/D conversion time " />
參數(shù)資料
型號: PIC16C433T-E/SO
廠商: Microchip Technology
文件頁數(shù): 71/126頁
文件大?。?/td> 0K
描述: IC MCU CMOS 8BIT 10MHZ 2K 18SOIC
標準包裝: 1,100
系列: PIC® 16C
核心處理器: PIC
芯體尺寸: 8-位
速度: 10MHz
連通性: LIN(本地互連網(wǎng)絡)
外圍設備: POR,WDT
輸入/輸出數(shù): 5
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): 4.5 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 4x8b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 125°C
封裝/外殼: 18-SOIC(0.295",7.50mm 寬)
包裝: 帶卷 (TR)
2002 Microchip Technology Inc.
Preliminary
DS41139B-page 47
PIC16C433
8.2
Selecting the A/D Conversion Clock
The A/D conversion time per bit is defined as TAD. The
A/D conversion requires 9.5 TAD per 8-bit conversion.
The source of the A/D conversion clock is software
selected. The four possible options for TAD are:
2TOSC
8TOSC
32TOSC
Internal ADC 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. If the minimum TAD time of 1.6 s can not be
obtained, TAD should be
≤ 8 s for preferred operation.
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 TRIS 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
CHS<2:0> 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 channel 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.
2: Analog levels on any pin that is defined as
a digital input (including the AN<3:0> pins)
may cause the input buffer to consume cur-
rent that is out of the devices specification.
AD Clock Source (T
AD)
Device Frequency
Operation
ADCS<1:0>
4 MHz
1.25 MHz
333.33 kHz
2TOSC
00
500 ns(2)
1.6
s6 s
8TOSC
01
2.0
s6.4 s
24
s(3)
32TOSC
10
8.0
s
25.6
s(3)
96
s(3)
Internal ADC RC Oscillator(5)
11
2 - 6
s(1,4)
2 - 6
s(1,4)
2 - 6
s(1)
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: While in RC mode, with device frequency above 1 MHz, conversion accuracy is out of specification.
5: For extended voltage devices (LC), please refer to Section 12.0, Electrical Specifications.
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