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| 型号： | PIC18F66J93-I/PT |
| 厂商： | Microchip Technology |
| 文件页数： | 28/54页 |
| 文件大小： | 0K |
| 描述： | IC PIC MCU FLASH 64KX4 64-TQFP |
| 产品培训模块： | PIC18 J Series MCU Overview |
| 标准包装： | 160 |
| 系列： | PIC® 18F |
| 核心处理器： | PIC |
| 芯体尺寸： | 8-位 |
| 速度： | 48MHz |
| 连通性： | I²C，LIN，SPI，UART/USART |
| 外围设备： | 欠压检测/复位，LCD，LVD，POR，PWM，WDT |
| 输入/输出数： | 51 |
| 程序存储器容量： | 64KB（32K x 16） |
| 程序存储器类型： | 闪存 |
| RAM 容量： | 3923 x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 2 V ~ 3.6 V |
| 数据转换器： | A/D 12x12b |
| 振荡器型： | 内部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 64-TQFP |
| 包装： | 托盘 |
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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 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格: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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