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參數(shù)資料
| 型號： | PIC18F66J93-I/PT |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 28/54頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC PIC MCU FLASH 64KX4 64-TQFP |
| 產(chǎn)品培訓(xùn)模塊： | PIC18 J Series MCU Overview |
| 標(biāo)準(zhǔn)包裝： | 160 |
| 系列： | PIC® 18F |
| 核心處理器： | PIC |
| 芯體尺寸： | 8-位 |
| 速度： | 48MHz |
| 連通性： | I²C，LIN，SPI，UART/USART |
| 外圍設(shè)備： | 欠壓檢測/復(fù)位，LCD，LVD，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 51 |
| 程序存儲器容量： | 64KB（32K x 16） |
| 程序存儲器類型： | 閃存 |
| RAM 容量： | 3923 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2 V ~ 3.6 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 12x12b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 64-TQFP |
| 包裝： | 托盤 |
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PIC18F87J93 FAMILY
DS39948A-page 32
Preliminary
2009 Microchip Technology Inc.
2.1
A/D Acquisition Requirements
For the A/D converter to meet its specified accuracy,
the charge holding capacitor (CHOLD) must be allowed
to fully charge to the input channel voltage level. The
analog input model is shown in Figure 2-2. The source
impedance (RS) and the internal sampling switch (RSS)
impedance directly affect the time required to charge
the capacitor CHOLD. The sampling switch (RSS)
impedance varies over the device voltage (VDD). The
source impedance affects the offset voltage at the ana-
log input (due to pin leakage current). The maximum
recommended impedance for analog sources is
2.5 k
Ω. After the analog input channel is selected
(changed), the channel must be sampled for at least
the minimum acquisition time before starting a
conversion.
To calculate the minimum acquisition time, Equation 2-1
may be used. This equation assumes that 1/2 LSb error
is used (1,024 steps for the A/D). The 1/2 LSb error is the
maximum error allowed for the A/D to meet its specified
resolution.
Equation 2-3 shows the calculation of the minimum
required acquisition time, TACQ. This calculation is
based
on
the
following
application
system
assumptions:
EQUATION 2-1:
ACQUISITION TIME
EQUATION 2-2:
A/D MINIMUM CHARGING TIME
EQUATION 2-3:
CALCULATING THE MINIMUM REQUIRED ACQUISITION TIME
Note:
When the conversion is started, the
holding capacitor is disconnected from the
input pin.
CHOLD
=25 pF
Rs
=
2.5 k
Ω
Conversion Error
≤
1/2 LSb
VDD
=3V
→ Rss = 2 kΩ
Temperature
=
85
°C (system max.)
TACQ
=
Amplifier Settling Time + Holding Capacitor Charging Time + Temperature Coefficient
=TAMP + TC + TCOFF
VHOLD
=
(VREF – (VREF/2048)) (1 – e(-T
C
/CHOLD(RIC + RSS + RS)))
or
TC
=
-(CHOLD)(RIC + RSS + RS) ln(1/2048)
TACQ
=TAMP + TC + TCOFF
TAMP
=0.2
μs
TCOFF
=
(Temp – 25
°C)(0.02 μs/°C)
(85
°C – 25°C)(0.02 μs/°C)
1.2
μs
Temperature coefficient is only required for temperatures > 25
°C. Below 25°C, TCOFF = 0 ms.
TC
=
-(CHOLD)(RIC + RSS + RS) ln(1/2048)
μs
-(25 pF) (1 k
Ω + 2 kΩ + 2.5 kΩ) ln(0.0004883) μs
1.05
μs
TACQ
=0.2
μs + 1 μs + 1.2 μs
2.4
μs
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| PIC18F66J93T-I/PT | 功能描述:8位微控制器 -MCU 64pin,4KB RAM,12MIPS SEG LCD, 64KB Flash RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC18F66J94-I/MR | 制造商:Microchip Technology Inc 功能描述:64 PINS, 64KB FLASH, 4KB RAM, 16MIPS, NANOWATT XLP, LCD, USB - Rail/Tube 制造商:Microchip Technology Inc 功能描述:IC MCU 8BIT 64KB FLASH 64QFN 制造商:Microchip Technology Inc 功能描述:64 pins, 64KB Flash, 4KB RAM, 16MIPS, nanoWatt XLP, LCD, USB, 64 QFN 9x9x0.9mm T |
| PIC18F66J94-I/PT | 制造商:Microchip Technology Inc 功能描述:64 PINS, 64KB FLASH, 4KB RAM, 16MIPS, NANOWATT XLP, LCD, USB - Trays 制造商:Microchip Technology Inc 功能描述:IC MCU 8BIT 64KB FLASH 64TQFP 制造商:Microchip Technology Inc 功能描述:64 pins, 64KB Flash, 4KB RAM, 16MIPS, nanoWatt XLP, LCD, USB, 64 TQFP 10x10x1mm |
| PIC18F66J94T-I/MR | 制造商:Microchip Technology Inc 功能描述:64 PINS, 64KB FLASH, 4KB RAM, 16MIPS, NANOWATT XLP, LCD, USB - Tape and Reel 制造商:Microchip Technology Inc 功能描述:IC MCU 8BIT 64KB FLASH 64QFN 制造商:Microchip Technology Inc 功能描述:8-bit Microcontrollers - MCU 64 pins 64KB Flash 4KB RAM 16MIPS 制造商:Microchip Technology Inc 功能描述:64 pins, 64KB Flash, 4KB RAM, 16MIPS, nanoWatt XLP, LCD, USB, 64 QFN 9x9x0.9mm T |
| PIC18F66J94T-I/PT | 制造商:Microchip Technology Inc 功能描述:64 PINS, 64KB FLASH, 4KB RAM, 16MIPS, NANOWATT XLP, LCD, USB - Tape and Reel 制造商:Microchip Technology Inc 功能描述:IC MCU 8BIT 64KB FLASH 64TQFP 制造商:Microchip Technology Inc 功能描述:8-bit Microcontrollers - MCU 64 pins, 64KB Flash, 4KB RAM, 16MIPS |
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