HMR3300 Datasheet HMR3200, HMR3200-DEMO-232, HMR3300-D00-232 | P10-P11

HMR3200/3300

10 www.honeywell.com

Synchronous Communication Protocol

The HMR3200/HMR3300 module controls the synchronous clock (SCK) and synchronous data output (SDO) pins and the

host controller controls synchronous data input (SDI) and chip select (CS) pins. The host controller shall lower the HMR

module’s CS pin for at least 20 microseconds to initiate the SPI communication. In response the HMR module will send

the ASCII bit pattern for 's', and the host shall transmit a valid command character simultaneously. The HMR module will

evaluate the command character received from the host controller and send the appropriate data if the command is

recognized and valid. After transmitting the required data, the HMR module will end the SPI session. If the command is

invalid or was not recognized, then the HMR module will transmit ASCII bit pattern for 'e' and end the SPI session.

SPI Commands

Heading Output: In response to an ASCII H or h command, the HMR3200/HMR3300 shall send two bytes of data. The

MSByte is transmitted first. These two bytes represent the integer value equal to 10*Heading. The MSbit is transmitted

first for each byte. SCK shall be high for 16, and low for 22 microseconds, respectively. There is a 50 microsecond delay

between consecutive bytes transmitted.

Command Character Action SPI Data Output Parameter Value

H or h Sends heading data 0000 to 3599 Heading: 000.0 to 359.9

Data Representation

Heading Output: In response to an H or h command, HMR3200/HMR3300 module shall send two bytes of data. The

MSByte is transmitted first. These two bytes represent the integer value equal to 10*Heading. The MSbit is transmitted

first for each byte.

SPI Timing

The SCK shall be high for 16, and low for 22 microseconds, respectively. There is a 50 microsecond delay between

consecutive bytes transmitted.

MS Byte

LS Byte

Tb = 50

sec

SCK

SDO

SDI

MS bit

Th ~ 16µsec

Tl ~ 22µsec

SCK

SDO

SDI

MS bit

Th ~ 16µsec

Tl ~ 22µsec

SPI Timing Diagram

SPI Heading Output

HMR3200/3300

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COMPASS DEMONSTRATION KIT

The HMR3200 or HMR3300 Demo kit includes additional hardware and Windows software to form a development kit for

electronic compassing. This kit includes the HMR3200 orHMR3300 Printed Circuit Board (PCB) module as a daughter

board, a TTL to RS-232 motherboard with a D9 serial port connector, 6’ serial port cable with attached AC adapter power

supply, and a Windows demo software CD with documentation. The cable is a 4-wire design with pins 2 and 3 NOT

flipped (DTE to DCE, not null modem) with pin 5 as the ground reference. Pin 9 is the unregulated positive voltage

reference and is factory connected to the AC adapter. Either cable side may be used for the compass demo kit or

computer serial port.

The AC adapter is a universal type and factory set for 120 VAC input, 9 volt DC output, and positive polarity. Users can

rewire the cable for battery operation for remote usage. Batteries chosen must apply the required 6 to 15 volt supply

range with at least 24mA current capability. If compact 9 volt batteries are used, it is recommended that two batteries of

the same chemistry be wired in parallel to have reasonable operational life.

The TTL to RS-232 motherboard is designed to handle only unregulated power supply voltages and routes the supply

directly to the V+ pin of the HMR3200 or HMR3300 daughterboard. The electronics on the motherboard convert the RX

and TX 5 volt logic to the ±6 volt RS-232 drive logic for computer serial ports.

ORDERING INFORMATION

Ordering Number Product

HMR3200

HMR3200-Demo-232

HMR3300

HMR3300-D00-232

HMR3300-Demo-232

PCB Module Only

PCB Module with Development Kit

PCB Module Only

PCB Module and RS-232 Motherboard

PCB Module with Development Kit

Find out more

For more information on Honeywell’s Magnetic Sensors visit us online at www.magneticsensors.com or contact us at

800-323-8295 (763-954-2474 internationally).

The application circuits herein constitute typical usage and interface of Honeywell product. Honeywell does not warranty or assume liability of customer-

designed circuits derived from this description or depiction.

Honeywell reserves the right to make changes to improve reliability, function or design. Honeywell does not assume any liability arising out of the

application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.

U.S. Patents 4,441,072, 4,533,872, 4,569,742, 4,681,812, 4,847,584 and 6,529,114 apply to the technology described

Honeywell

12001 Highway 55

Plymouth, MN 55441

Tel: 800-323-8295

www.honeywell.com/magneticsensors

Form #900266 Rev F

December 2005

well International Inc.

P1-P3 P4-P6 P7-P9 P10-P11

HMR3300

Mfr. #:

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