27961 Parallax Inc, 27961 Datasheet - Page 7

• Manufacturer Part Number: 27961
• Description: MODULE MOTOR MIND SIP
• Manufacturer: Parallax Inc

Specifications of 27961

• Product: Microcontroller Accessories
• Operating Supply Voltage: 6 to 36 V
• Board Size: 30.48 mm x 25.4 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Motor Mind B enhanced
Data Sheet
3.6 Differences Between the MMBe and earlier MMB
Area of difference
Hardware Changes
Physical
Protection
Peak Current
Continuous Current no cooling
Motor Voltage
TM Pin
Firmware Changes
1-wire communication (sharing the TM-
FM pins with a single i/o on the master
unit)
PWM Frequency
How to exit SPDCON mode
SPDCON control
How to exit COUNT command before
count is completed
Serial response time to TACH command
Tachometer range
Tachometer resolution
Baud Rate
Command response times
STATUS register
3.7 Two’s Compliment Number System
negative value take the binary or hexadecimal representation of the absolute value of the number,
compliment it (every 1 becomes a 0 and every 0 becomes a 1) and add 1 to the result. For 8-bit number
you can also subtract the absolute value of the negative number from 256. Example: 256 - | -65 | => 256
– 65 = 191 = 0xBF.
The SETDC_DIR command accepts negative numbers.
Number
-127
-65
Absolute Value
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127
65
MMBe
no heat sink, has indicator LEDS
under-voltage,
temperature
6A
1.75A
6-36VDC
Has a series 270Ω resistor to prevent
shorting to ground.
resistors used on this pin should be 10KΩ or
greater
1-wire communication is possible but care
should be taken to ensure that the FM-TM
connection at the master unit is primarily
configured as an input. The TM pin on the
MMBe is always an output and unless
responding to commands is driven to +5V.
A series 270Ω resistor protects this pin from
shorting which would otherwise occur if FM
were driven low while connected to TM.
242Hz or 15.5Khz (can be toggled with
CHANGE_FREQ command)
Any command other than SPDCON or
SPDCON_FREQ will cause SPDCON mode
to be exited
Includes
method and a proportional-integral (PI)
control loop.
toggled with SPDCON_MODE command.
Send EXIT_COUNT command.
5ms
0-65,535Hz
8Hz, options for sending GATETIME have
been removed.
accepted but no longer effects tachometer
measurement time or resolution.
2.4KBPS or 9.6KBPS (can be toggled with
CHANGE_BAUD command).
SPDCON-TACH commands may take as
long
GATETIME is not sent. Other commands
respond in 500-1000us.
The reset flag bit was removed and
additional bits have been defined (PIMODE,
FAULT,
BAUD9600).
Two’s Compliment Examples
as
both
5ms
BRAKEON,
Mode of SPDCON can be
Hexadecimal
the
to
GATETIME value is still
over-current,
0x7F
0x41
respond
Any external pull-up
increment/decrement
In order to generate a two’s compliment
FREQLOW,
if
optional
over-
Compliment
7-30VDC
MMB
silver heat sink
over-temperature
3.5A
1.3A
Has pull-up resistor on PCB and is
only actively drive low (pseudo open-
collector).
Pseudo-open collector TM pin allows-1
wire communication
61Hz
FM
GATETIME x 2, then returned to +5V
Motor
decremented based on desired speed
A hard power reset is required
Varied based on GATETIME value
0-65,535Hz
Varied based on GATETIME value
2.4KBPS
Commands are responded to within
500-1000us
Direction and reset bits are available
0xBE
0x80
line
speed
must
is
Solutions Cubed
be
Two's Compliment
incremented
held
0xBF
0x81
Page 7
low
for
or