DSPIC30F2010-20E/MM Microchip Technology, DSPIC30F2010-20E/MM Datasheet - Page 112
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DSPIC30F2010-20E/MM
Manufacturer Part Number
DSPIC30F2010-20E/MM
Description
IC,DSP,16-BIT,CMOS,LLCC,28PIN,PLASTIC
Manufacturer
Microchip Technology
Series
dsPIC™ 30Fr
Datasheets
1.DSPIC30F2011-20IP.pdf
(26 pages)
2.DSPIC30F2010-20ISO.pdf
(202 pages)
3.DSPIC30F2010-20ISO.pdf
(6 pages)
4.DSPIC30F2010-20ISO.pdf
(26 pages)
Specifications of DSPIC30F2010-20E/MM
Core Processor
dsPIC
Core Size
16-Bit
Speed
20 MIPS
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, Motor Control PWM, QEI, POR, PWM, WDT
Number Of I /o
20
Program Memory Size
12KB (4K x 24)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
2.5 V ~ 5.5 V
Data Converters
A/D 6x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
28-QFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
AC164322 - MODULE SOCKET MPLAB PM3 28/44QFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
DSPIC30F2010-20E/MM
Manufacturer:
Microchip Technology
Quantity:
135
dsPIC30F2010
18.1
The module contains a 16-word dual port read-only buf-
fer, called ADCBUF0 through ADCBUFF, to buffer the
ADC results. The RAM is 10 bits wide, but is read into dif-
ferent format 16-bit words. The contents of the sixteen
ADC conversion result buffer registers, ADCBUF0
through ADCBUFF, cannot be written by user software.
18.2
After the ADC module has been configured, the sample
acquisition is started by setting the SAMP bit. Various
sources, such as a programmable bit, timer time-outs
and external events, will terminate acquisition and start
a conversion. When the A/D conversion is complete,
the result is loaded into ADCBUF0...ADCBUFF, and
the A/D interrupt flag ADIF and the DONE bit are set
after the number of samples specified by the SMPI bit.
The following steps should be followed for doing an
A/D conversion:
1.
2.
3.
4.
5.
6.
7.
18.3
Several groups of control bits select the sequence in
which the A/D connects inputs to the sample/hold
channels, converts channels, writes the buffer memory,
and generates interrupts. The sequence is controlled
by the sampling clocks.
The
sequence for multiple channels. If the SIMSAM bit is
‘0’, the two or four selected channels are acquired and
converted sequentially, with two or four sample clocks.
If the SIMSAM bit is ‘1’, two or four selected channels
are acquired simultaneously, with one sample clock.
The channels are then converted sequentially. Obvi-
ously, if there is only one channel selected, the
SIMSAM bit is not applicable.
DS70118J-page 112
Configure the ADC module:
- Configure analog pins, voltage reference
- Select A/D input channels
- Select A/D conversion clock
- Select A/D conversion trigger
- Turn on A/D module
Configure A/D interrupt (if required):
- Clear ADIF bit
- Select A/D interrupt priority
Start sampling.
Wait the required acquisition time.
Trigger acquisition end, start conversion
Wait for A/D conversion to complete, by either:
- Waiting for the A/D interrupt
- Waiting for the DONE bit to get set
Read A/D result buffer, clear ADIF if required.
SIMSAM
and digital I/O
A/D Result Buffer
Conversion Operation
Selecting the Conversion
Sequence
bit
controls
the
acquire/convert
The CHPS bits selects how many channels are sam-
pled. This can vary from 1, 2 or 4 channels. If CHPS
selects 1 channel, the CH0 channel will be sampled at
the sample clock and converted. The result is stored in
the buffer. If CHPS selects 2 channels, the CH0 and
CH1 channels will be sampled and converted. If CHPS
selects 4 channels, the CH0, CH1, CH2 and CH3
channels will be sampled and converted.
The SMPI bits select the number of acquisition/conver-
sion sequences that would be performed before an
interrupt occurs. This can vary from 1 sample per
interrupt to 16 samples per interrupt.
The user cannot program a combination of CHPS and
SMPI bits that specifies more than 16 conversions per
interrupt, or 8 conversions per interrupt, depending on
the BUFM bit. The BUFM bit, when set, will split the
16-word results buffer (ADCBUF0...ADCBUFF) into
two 8-word groups. Writing to the 8-word buffers will be
alternated on each interrupt event. Use of the BUFM bit
will depend on how much time is available for moving
data out of the buffers after the interrupt, as determined
by the application.
If the processor can quickly unload a full buffer within
the time it takes to acquire and convert one channel,
the BUFM bit can be ‘0’ and up to 16 conversions may
be done per interrupt. The processor will have one
sample and conversion time to move the sixteen
conversions.
If the processor cannot unload the buffer within the
acquisition and conversion time, the BUFM bit should
be ‘1’. For example, if SMPI<3:0> (ADCON2<5:2>) =
0111, then eight conversions will be loaded into 1/2
of the buffer, following which an interrupt occurs. The
next eight conversions will be loaded into the other
1/2 of the buffer. The processor will have the entire
time
conversions.
The ALTS bit can be used to alternate the inputs
selected during the sampling sequence. The input mul-
tiplexer has two sets of sample inputs: MUX A and
MUX B. If the ALTS bit is ‘0’, only the MUX A inputs are
selected for sampling. If the ALTS bit is ‘1’ and
SMPI<3:0> = 0000, on the first sample/convert
sequence, the MUX A inputs are selected, and on the
next acquire/convert sequence, the MUX B inputs are
selected.
The CSCNA bit (ADCON2<10>) will allow the CH0
channel inputs to be alternately scanned across a
selected number of analog inputs for the MUX A group.
The inputs are selected by the ADCSSL register. If a
particular bit in the ADCSSL register is ‘1’, the corre-
sponding input is selected. The inputs are always
scanned from lower to higher numbered inputs, starting
after each interrupt. If the number of inputs selected is
greater than the number of samples taken per interrupt,
the higher numbered inputs are unused.
between
interrupts
© 2011 Microchip Technology Inc.
to
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