HMC6352 Datasheet, PDF (13/13 Pages) Honeywell Solid State Electronics Center – Digital Compass Solution

HMC6352
Amplifier Filter Connections
The HMC6352 design has provisions for the feedback loop of each amplifier stage to be accessible via the CA1, CA2,
CB1, and CB2 pin contacts. Across the contacts and internal to the HMC6352 is the amplifier section plus a 1200k-ohm
feedback resistance to set the voltage gain. By placing small value ceramic capacitors across CA1 to CA2 (or CB1 to
CB2), the designer can set the –3dB bandwidth of the amplified magnetometer signals to drop spurious magnetic
interference in the system. For example a 120 pico-Farad capacitor (Cext) in the amplifier feedback loop would limit the
bandwidth to about 1kHz. Be aware that larger values of capacitance begin to slow the amplifier response to where the
measurement delay time EEPROM byte may have to be increased in value to let the signal settle before making a
measurement. Figure 2 shows the partial schematic of the amplifier feedback loop.
Figure 2
Amplifier Filter Connections
An optional gain reducing resistor (Rext) could also place across the feedback loop of the amplifier stages. With the
amplifier set with the internal 1200 k-ohm feedback for ±750 milli-gauss maximum magnetic field flux density, a second
1200k-ohm external resistor would halve the gain and permit ±1.5 gauss capability if desired. Gain can be reduced for up
to ±6 gauss capability for magnetometry-only applications or compassing with significant magnetic stray fields nearby.
ORDERING INFORMATION
Ordering Number
HMC6352
Product
Digital Compass Solution, I2C
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
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