參數(shù)資料
型號(hào)： DSPIC30F5015-30I/PT
廠商： Microchip Technology
文件頁(yè)數(shù)： 120/129頁(yè)
文件大?。?/td> 0K
描述： IC DSPIC MCU/DSP 66K 64TQFP
產(chǎn)品培訓(xùn)模塊： dsPIC30F Quadrature Encoder Interface
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
標(biāo)準(zhǔn)包裝： 160
系列： dsPIC™ 30F
核心處理器： dsPIC
芯體尺寸： 16-位
速度： 30 MIP
連通性： CAN，I²C，SPI，UART/USART
外圍設(shè)備： 高級(jí)欠壓探測(cè)/復(fù)位，電機(jī)控制 PWM，QEI，POR，PWM，WDT
輸入/輸出數(shù)： 52
程序存儲(chǔ)器容量： 66KB（22K x 24）
程序存儲(chǔ)器類(lèi)型： 閃存
EEPROM 大?。?/td> 1K x 8
RAM 容量： 2K x 8
電壓 - 電源 (Vcc/Vdd)： 2.5 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 16x10b
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(pán)
產(chǎn)品目錄頁(yè)面： 651 (CN2011-ZH PDF)
配用： XLT64PT5-ND - SOCKET TRAN ICE 64MQFP/TQFP
AC164319-ND - MODULE SKT MPLAB PM3 64TQFP
DV164005-ND - KIT ICD2 SIMPLE SUIT W/USB CABLE
其它名稱(chēng)： DSPIC30F501530IPT
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dsPIC30F5015/5016
DS70149D-page 90
2008 Microchip Technology Inc.
14.1
Quadrature Encoder Interface
Logic
A typical incremental (a.k.a. optical) encoder has three
outputs: Phase A, Phase B and an index pulse. These
signals are useful and often required in position and
speed control of ACIM and SR motors.
The two channels, Phase A (QEA) and Phase B (QEB),
have a unique relationship. If Phase A leads Phase B,
then the direction (of the motor) is deemed positive or
forward. If Phase A lags Phase B, then the direction (of
the motor) is deemed negative or reverse.
A third channel, termed index pulse, occurs once per
revolution and is used as a reference to establish an
absolute position. The index pulse coincides with
Phase A and Phase B, both low.
14.2
16-bit Up/Down Position Counter
Mode
The 16-bit up/down counter counts up or down on
every count pulse, which is generated by the difference
of the Phase A and Phase B input signals. The counter
acts as an integrator, whose count value is proportional
to position. The direction of the count is determined by
the UPDN signal, which is generated by the
Quadrature Encoder Interface logic.
14.2.1
POSITION COUNTER ERROR
CHECKING
Position count error checking in the QEI is provided for
and indicated by the CNTERR bit (QEICON<15>). The
error checking only applies when the position counter
is configured for Reset on the Index Pulse modes
(QEIM<2:0> = 110 or 100). In these modes, the
contents of the POSCNT register are compared with
the values (0xFFFF or MAXCNT + 1, depending on
direction). If these values are detected, an error
condition is generated by setting the CNTERR bit and
a QEI count error interrupt is generated. The QEI count
error interrupt can be disabled by setting the CEID bit
(DFLTCON<8>). The position counter continues to
count encoder edges after an error has been detected.
The POSCNT register continues to count up/down until
a natural rollover/underflow. No interrupt is generated
for the natural rollover/underflow event. The CNTERR
bit is a read/write bit and reset in software by the user.
14.2.2
POSITION COUNTER RESET
The Position Counter Reset Enable bit, POSRES
(QEICON<2>), controls whether the position counter is
reset when the index pulse is detected. This bit is only
applicable when QEIM<2:0> = 100 or 110.
If the POSRES bit is set to ‘1’, then the position counter
is reset when the index pulse is detected. If the
POSRES bit is set to ‘0’, then the position counter is not
reset when the index pulse is detected. The position
counter will continue counting up or down, and will be
reset on the rollover or underflow condition.
The interrupt is still generated on the detection of the
index pulse and not on the position counter
overflow/underflow.
14.2.3
COUNT DIRECTION STATUS
As mentioned in the previous section, the QEI logic
generates an UPDN signal, based upon the
relationship between Phase A and Phase B. In addition
to the output pin, the state of this internal UPDN signal
is supplied to a SFR bit, UPDN (QEICON<11>), as a
read-only bit. To place the state of this signal on an I/O
pin, the SFR bit, PCDOUT (QEICON<6>), must be ‘1’.
14.3
Position Measurement Mode
There are two measurement modes which are
supported and are termed x2 and x4. These modes are
selected by the QEIM<2:0> mode select bits located in
SFR QEICON<10:8>.
When control bits QEIM<2:0> = 100 or 101, the x2
Measurement mode is selected and the QEI logic only
looks at the Phase A input for the position counter
increment rate. Every rising and falling edge of the
Phase A signal causes the position counter to be
incremented or decremented. The Phase B signal is
still utilized for the determination of the counter
direction, just as in the x4 mode.
Within the x2 Measurement mode, there are two
variations of how the position counter is reset:
Position counter reset by detection of index pulse,
QEIM<2:0> = 100.
Position counter reset by match with MAXCNT,
QEIM<2:0> = 101.
When control bits QEIM<2:0> = 110 or 111, the x4
Measurement mode is selected and the QEI logic looks
at both edges of the Phase A and Phase B input
signals. Every edge of both signals causes the position
counter to increment or decrement.
Within the x4 Measurement mode, there are two
variations of how the position counter is reset:
Position counter reset by detection of index pulse,
QEIM<2:0> = 110.
Position counter reset by match with MAXCNT,
QEIM<2:0> = 111.
The x4 Measurement mode provides for finer
resolution data (more position counts) for determining
motor position.
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