L36C datasheet(53/75 Pages) RENESAS

53 / 75 page

R8C/L35C Group, R8C/L36C Group, R8C/L38C Group, R8C/L3AC Group

5. Electrical Characteristics

REJ03B0293-0100 Rev.1.00

Page 53 of 72

Jun 25, 2010

Notes:

1. Time until the voltage monitor 2 interrupt request is generated after the voltage passes Vdet2.

2. Necessary time until the voltage detection circuit operates after setting to 1 again after setting the VCA27 bit in the VCA2

Note:

1. 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 Characteristics

Table 5.10

Voltage Detection 2 Circuit Characteristics

(VCC = 1.8 to 5.5 V and Topr =

−20 to 85°C (N version) / −40 to 85°C (D version), unless

otherwise specified.)

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

—

Hysteresis width at the rising of Vcc in voltage detection

2 circuit

—0.10—

—

Voltage detection 2 circuit response time (1)

At the falling of Vcc from

5 V to (Vdet2_0

− 0.1) V

—

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 (2)

—

100

µs

Table 5.11

Power-on Reset Circuit Characteristics (1)

(Topr =

−20 to 85°C (N version) / −40 to 85°C (D version), unless otherwise specified.)

Symbol

Parameter

Condition

Standard

Unit

Min.

Typ.

Max.

trth

External power VCC rise gradient

—

50000 mV/msec

Notes:

1. Vdet0 indicates the voltage detection level of the voltage detection 0 circuit. Refer to 6. Voltage Detection

Circuit in the User’s Manual: Hardware 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)

fOCO-S

× 32

fOCO-S

× 32

External

Power VCC

trth

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