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M62055FP

3 V Power Supply with Watchdog Timer

Renesas Electronics 

M62055FP

1. Pin (3) (TC pin) Charging and Discharging Time

When an error is occurred in RD input, TC waveform is as shown in figure 1.

VTH1(H)

VO

0

output cutoff

VTH1(L)

↑ ≈0.9V

VTH2(H)

TC

VTH2(L)

0

tRST(1)

tWD

tRST(2)

tRST(1) = 0.406 ⋅ C ⋅ R1 + 300µs*1

tWD = 1.2 ⋅ C ⋅ R1 (Charging time)

Note: 1. Inside delay time (Typ)

Figure 1

VO = 3.0V

R1

3

C

The following formula can be obtained because tRST(2) is equal to the duration of VO cutoff.

tRST(2) = C ⋅ R*2 ⋅ ln

3

0.9

+ 300µs*3

= 40 ⋅ C + 300µs*3

Note: 2. R = Internal resistance

3. Inside delay time (Typ)

Figure 2

Al

C

cutoff Tr

Rev.2.00 Mar 10, 2006 page 5 of 9

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