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HMC1021D Datasheet(PDF) 11 Page - Honeywell Solid State Electronics Center |
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HMC1021D Datasheet(HTML) 11 Page - Honeywell Solid State Electronics Center |
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11 / 15 page  LINEAR MAGNETIC FIELD SENSORS 11 Low Power—For low power application, down to 3.3 volt supply, the circuit shown in Figure 15 can be used. These low threshold FETs provide low on-resistance (0.3 Ω) at VGS=2.7V. The set/reset pulsing does not need to be continuous. To save power, the SET pulse can be initially applied followed by a single RESET pulse. The offset (OS) can be calculated as: OS = (Vset + Vrst)/2 This offset term will contain the DC offset of both the sensor bridge and interface electronics, as well as the temperature drift of the bridge and interface electronics. Store this value and subtract it from all future bridge output readings. Once the bridge is RESET, it will remain in that state for years— or until a disturbing field (>20 gauss) is applied. A timer can be set, say every 10 minutes, to periodically update the offset term. A flow chart is shown in Figure 14 along with a timing diagram in Figure 15 to illustrate this process. Figure 13—Set/Reset Pulse With Clock Control (1021/1022) Figure 15—Single Clock Set/Reset Pulse Circuit (1021/1022) Figure 14—Low Power Set/Rst Flowchart SET Pulse Read Vset RESET Pulse Read Vrst OS = (Vset+Vrst)/2 Vout = Vrst - OS Timer expired? Read Vrst y n 9,15 1µF (1) +5 to 6V 14 HMC1022 Clock S/R 1 2 4 3 5,6 7,8 (1) Tantalum, low R (2) Rds ~0.2 ohm 200 8 set rst set Clock S/R 4 to14V -4 to -14V TPW ~ 2 µsec 5V set reset IRF7105 (2) DI9952 (2) 0.1µF Ta Reset Set S/R Vp -Vp Ta > 5 µsec Tb > 1 µsec Tc > 20 µsec, 50 msec(max) TPW ~ 2 µsec Td > 20 µsec Vp > 3 V TPW set reset Tb Ta Tc read Vset read Vrst Td Td Vout 1µF (1) +3.3 to 6.5V Reset NDS9933 2,4 1,3 5,6,7,8 (1) Tantalum, low R (2) Rds ~0.2 ohm Set 200 5,6,7,8 1,3 2,4 NDS8926 9,15 14 HMC1022 S/R 8 0.1µF + |
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