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S-8880A22-M5T1U Datasheet(PDF) 7 Page - Seiko Instruments Inc |
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S-8880A22-M5T1U Datasheet(HTML) 7 Page - Seiko Instruments Inc |
7 / 30 page ENERGY HARVESTING POWERED BY ULTRA-LOW POWER AND ULTRA-LOW VOLTAGE OPERATION BOOST CHARGE PUMP FOR STEP-UP DC-DC CONVERTER STARTUP Rev.1.0_01 S-8880A Series 7 2. Step-up DC-DC converter output voltage monitor pin (VM pin) When the output voltage of the step-up DC-DC converter to be monitored rises and the VM pin voltage (VVM) reaches or exceeds the power-off voltage (VOFF), the power-off status is entered. When this happens, the internal oscillation circuit stops its operation, so that the charge pump circuit operation stops, and greatly reduces the current consumption. Figure 4 shows the configuration of the VM pin. VREF VM pin + − Table 8 VM Pin Internal Circuit VVM < VOFF Operate VVM ≥ VOFF Stop Figure 4 VM Pin Configuration Set VVM during power-off as follows. 3.0 V ≥ VVM ≥ VIN + 1.0 V 3.0 V ≥ VVM ≥ VOUT When VVM < VIN + 1.0 V occurs, the current consumption during power-off increases. When VVM < VOUT occurs, the discharge control switch leakage current increases. Caution 1. When not using the VM pin in actual use, be sure to connect it to the VSS pin. If the VM pin is left open, it may cause malfunctions. 2. Note that the operation to restart a step-up DC-DC converter does not start when CPOUT pin voltage (VCPOUT) exceeds the discharge stop voltage (VCPOUT2) even if the power-off status is released. This operation restarts if VCPOUT decreases to VCPOUT2 or lower by discharge of the startup capacitor (CCPOUT). 3. Do not connect a high resistance to the VM pin. Note that the VM pin input current (IVM) max. may not flow if a high resistance is connected. |
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