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Additional masters and slaves can be added to the I C bus traces without interface trouble to the HMC6352. There are no
HMC6352
The 0.01 μ F supply decoupling capacitor in this reference can be omitted if another supply filter capacitor is already
included in the overall circuit design. If the supply traces extend beyond a couple inches to the HMC6352, it is advisable
to add a local supply decoupling capacitor near the HMC6352 to retain optimum circuit stability.
2
periodic maintenance commands required, and even HMC6352 sleep mode or power shutdown can be accomplished
without harm to the data or clock lines.
The MCP100 power-up reset chip serves as supply brown-out protection, and is optional in usage. Solid and rapid power
supply rise times are recommended, as some bench supplies may create soft starts that can cause internal processor
clock delays and timing issues. A mechanical on/off switch between the supply and the circuits will cure these kinds of
starting concerns.
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.
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