参数资料
型号: DSPIC30F4013-20I/PT
厂商: Microchip Technology
文件页数: 39/153页
文件大小: 0K
描述: IC DSPIC MCU/DSP 48K 44TQFP
产品培训模块: Serial Communications using dsPIC30F CAN
Serial Communications using dsPIC30F I2C
Serial Communications using dsPIC30F SPI
Serial Communications using dsPIC30F UART
dsPIC30F 12 bit ADC - Part 2
dsPIC30F Addressing Modes - Part 1
dsPIC30F Architecture - Part 1
dsPIC30F DSP Engine & ALU
dsPIC30F Interrupts
dsPIC30F Motor Control PWM
dsPIC Timers
Asynchronous Stimulus
dsPIC30F Addressing Modes - Part 2
dsPIC30F Architecture - Part 2
dsPIC30F 12-bit ADC Part 1
标准包装: 160
系列: dsPIC™ 30F
核心处理器: dsPIC
芯体尺寸: 16-位
速度: 20 MIPS
连通性: CAN,I²C,SPI,UART/USART
外围设备: AC'97,欠压检测/复位,I²S,POR,PWM,WDT
输入/输出数: 30
程序存储器容量: 48KB(16K x 24)
程序存储器类型: 闪存
EEPROM 大小: 1K x 8
RAM 容量: 2K x 8
电压 - 电源 (Vcc/Vdd): 2.5 V ~ 5.5 V
数据转换器: A/D 13x12b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 44-TQFP
包装: 托盘
配用: XLT44PT3-ND - SOCKET TRAN ICE 44MQFP/TQFP
AC164305-ND - MODULE SKT FOR PM3 44TQFP
其它名称: DSPIC30F401320IPT
2010 Microchip Technology Inc.
DS70138G-page 133
dsPIC30F3014/4013
19.4
Programming the Start of
Conversion Trigger
The conversion trigger terminates acquisition and
starts the requested conversions.
The SSRC<2:0> bits select the source of the conver-
sion trigger. The SSRC bits provide for up to 4 alternate
sources of conversion trigger.
When SSRC<2:0> = 000, the conversion trigger is
under software control. Clearing the SAMP bit causes
the conversion trigger.
When SSRC<2:0> = 111 (Auto-Convert mode), the
conversion trigger is under A/D clock control. The
SAMC bits select the number of A/D clocks between
the start of acquisition and the start of conversion. This
provides the fastest conversion rates on multiple
channels. The SAMC bits must always be at least one
clock cycle.
Other trigger sources can come from timer modules or
external interrupts.
19.5
Aborting a Conversion
Clearing the ADON bit during a conversion aborts the
current conversion and stops the sampling sequencing
until the next sampling trigger. The ADCBUF is not
updated with the partially completed A/D conversion
sample. That is, the ADCBUF will continue to contain
the value of the last completed conversion (or the last
value written to the ADCBUF register).
If clearing of the ADON bit coincides with an auto-start,
the clearing has a higher priority and a new conversion
does not start.
19.6
Selecting the ADC Conversion
Clock
The ADC conversion requires 14 TAD. The source of
the ADC conversion clock is software selected, using a
6-bit counter. There are 64 possible options for TAD.
EQUATION 19-1:
ADC CONVERSION
CLOCK
The internal RC oscillator is selected by setting the
ADRC bit.
For correct ADC conversions, the ADC conversion
clock (TAD) must be selected to ensure a minimum TAD
time of 334 nsec (for VDD = 5V). Refer to Section 23.0
other operating conditions.
Example 19-1 shows a sample calculation for the
ADCS<5:0> bits, assuming a device operating speed
of 30 MIPS.
EXAMPLE 19-1:
ADC CONVERSION
CLOCK AND SAMPLING
RATE CALCULATION
TAD = TCY * (0.5*(ADCS<5:0> + 1))
Minimum TAD = 334 nsec
ADCS<5:0> = 2
– 1
TAD
TCY
TCY = 33.33 nsec (30 MIPS)
= 2
– 1
334 nsec
33.33 nsec
= 19
Therefore,
Set ADCS<5:0> = 19
Actual TAD =
(ADCS<5:0> + 1)
TCY
2
=
(19 + 1)
33.33 nsec
2
= 334 nsec
If SSRC<2:0> = 111 and SAMC<4:0> = 00001
Since,
Sampling Time = Acquisition Time + Conversion Time
= 1 TAD + 14 TAD
= 15 x 334 nsec
Therefore,
Sampling Rate =
= ~200 kHz
1
(15 x 334 nsec)
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