M62050P datasheet(6/12 Pages) RENESAS

6 / 12 page

M62050P/FP

REJ03D0786-0200 Rev.2.00 Jun 15, 2007

Page 6 of 11

1. Pin(2) (TC pin) charge time and discharge time

When input to WD pin is abnormal, TC pin output waveform is as shown below:

tWD

tRST(1)

tRST(2)

⋅ VCC

tRST(1) = 0.51 ⋅ C ⋅ R1

tWD = 1.1 ⋅ C ⋅ R1 (charge time)

tRST(2) = 1000 ⋅ C ⋅ ln

(discharge time)

VCC

1000

+ 1

⋅

⋅ VCC – VCC

1000

VCC ⋅

– VCC –

VCC

∗ Please set it within the range

of 10k

Ω ≤ R1 ≤ 30kΩ.

Figure 3

Please set the time of tWD and tRST(2) within the following range.

110

µs ≤ t

WD ≤ 1.1 s

8.3

µs ≤ t

RST(2) ≤ 83 ms

2. Pin (1) (WD pin) input frequency, input pulse width, charge time and discharge time

When input to WD pin is normal, TC pin output waveform is as shown below:

tWDIN

(VCC = 3V)

(charge time)

t2 = 1000 ⋅ C ⋅ ln

(discharge time)

t1 = C ⋅ R1 ⋅ ln

1000

+ 1)

⋅ x – VCC

(

1000

– (VCC –VCC)

VCC ⋅

VCC – x

VCC –VCC

Pin (2)

Input

⋅ VCC)

2.4V

⋅ VCC)

1.2V

Figure 4

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