M5295AFP View Datasheet(PDF) - Renesas Electronics

Part Name

Description

Manufacturer

M5295AFP

Watchdog Timer

Renesas Electronics 

M5295AL/AP/AFP

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:

TC

0V

tWD

4

5

⋅ VCC

2

5

⋅ VCC

tRST(1)

tRST(2)

tRST(1) = 0.51 ⋅ C ⋅ R1

tWD = 1.1 ⋅ C ⋅ R1 (charge time)

4 ⋅ R1 – 1

tRST(2) = 1000 ⋅ C ⋅ ln

1000

2 ⋅ R1 – 3

(discharge time)

1000

VCC

R1

2

C

Resistance R1: 10kΩ ≤ R1 ≤ 30kΩ

When R1 is 10kΩ, tRST(2) is 830 ⋅ C

Figure 2

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:

Pin (2) xV

t1 t2

(VCC = 5V)

4V

2V

Input

tWDIN

t1 = C ⋅ R1 ⋅ ln

3

5–x

( R1 + 1) x – 5

t2 = 1000 ⋅ C ⋅ ln

1000

2 ⋅ R1 – 3

1000

Figure 3

(charge time)

(discharge time)

REJ03D0780-0200 Rev.2.00 Jun 15, 2007

Page 5 of 12

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