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CC2420Z-RTR1 数据表(PDF) 52 Page - Texas Instruments |
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CC2420Z-RTR1 数据表(HTML) 52 Page - Texas Instruments |
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52 / 92 page  CC2420 SWRS041B Page 52 of 89 In applications where the internal voltage regulator is not used, connect VREG_EN and VREG_IN to ground. VREG_OUT shall be left open. Note that the battery monitor will not work when the voltage regulator is not used. VREG_IN Internal bandgap voltage reference 1.25 V VREG_OUT VREG_EN Regulator Enable / disable Figure 28. Voltage regulator, simplified schematic 30 Battery Monitor The on-chip battery monitor enables monitoring the unregulated voltage on the VREG_IN pin. It gives status information on the voltage being above or below a programmable threshold. A simplified schematic of the battery monitor is shown in Figure 29. VREG_IN Internal bandgap voltage reference 1.25 V BATTMON.BATTMON_VOLTAGE[4:0] BATTMON.BATTMON_OK BATTMON.BATTMON_EN Figure 29. Battery monitor, simplified schematic |
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