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R5F21357CDFP Datasheet(PDF) 35 Page - Renesas Technology Corp |
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R5F21357CDFP Datasheet(HTML) 35 Page - Renesas Technology Corp |
35 / 57 page R8C/35C Group 5. Electrical Characteristics R01DS0006EJ0100 Rev 1.00 Page 35 of 54 Aug. 24, 2010 Notes: 1. The measurement condition is VCC = 1.8 V to 5.5 V and Topr = −20 to 85°C (N version) / −40 to 85°C (D version). 2. Time until the voltage monitor 2 interrupt request is generated after the voltage passes Vdet2. 3. Necessary time until the voltage detection circuit operates after setting to 1 again after setting the VCA27 bit in the VCA2 register to 0. Notes: 1. The measurement condition is Topr = −20 to 85°C (N version) / −40 to 85°C (D version), unless otherwise specified. 2. To use the power-on reset function, enable voltage monitor 0 reset by setting the LVDAS bit in the OFS register to 0. Figure 5.3 Power-on Reset Circuit Electrical Characteristics Table 5.10 Voltage Detection 2 Circuit Electrical Characteristics Symbol Parameter Condition Standard Unit Min. Typ. Max. Vdet2 Voltage detection level Vdet2_0 At the falling of VCC 3.70 4.00 4.30 V − Hysteresis width at the rising of Vcc in voltage detection 2 circuit − 0.10 − V − Voltage detection 2 circuit response time (2) At the falling of Vcc from 5 V to (Vdet2_0 − 0.1) V − 20 150 µs − Voltage detection circuit self power consumption VCA27 = 1, VCC = 5.0 V − 1.7 −µA td(E-A) Waiting time until voltage detection circuit operation starts (3) −− 100 µs Table 5.11 Power-on Reset Circuit (2) Symbol Parameter Condition Standard Unit Min. Typ. Max. trth External power VCC rise gradient (1) 0 − 50,000 mV/msec Notes: 1. Vdet0 indicates the voltage detection level of the voltage detection 0 circuit. Refer to 6. Voltage Detection Circuit of User’s Manual: Hardware (REJ09B0567) for details. 2. tw(por) indicates the duration the external power VCC must be held below the valid voltage (0.5 V) to enable a power-on reset. When turning on the power after it falls with voltage monitor 0 reset disabled, maintain tw(por) for 1 ms or more. Vdet0 (1) 0.5 V Internal reset signal tw(por) (2) Voltage detection 0 circuit response time Vdet0 (1) 1 fOCO-S × 32 1 fOCO-S × 32 External Power VCC trth trth |
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