mc33197d ETC-unknow, mc33197d Datasheet - Page 5

• Manufacturer Part Number: mc33197d
• Description: Automotive Wash Wiper Timer
• Manufacturer: ETC-unknow

Overvoltage Protection
all of the foregoing operational cases require:
By using the above component values, the circuit will be able
to sustain the following overvoltages on V bb without
permanent damage:
repeated 3 times at 1.0 minute intervals.
with a maximum energy of 1.0 Joule.
Recommended External Component Values
the device will operate properly, and that all specified
parameters will stay within their tolerances.
220
parameter could be out of it’s specified value (see Electrical
Characteristics and Note 1). Also, the minimum operating
voltage range should be greater than 8.0 V. The following
values should be adhered to:
MOTOROLA ANALOG IC DEVICE DATA
In reference to the Block Diagram and Typical Application,
R1
R3
The circuit will not operate during the transient conditions.
1. +28 V for 5 minutes
2. –15 V for 5 minutes
3. –16 V cycled off for 1.0 minute
4. +80 V pulse decaying exponentially to 8.0 V in 400 ms
5.
6. 100 V pulse decaying exponentially to 10 V in 2 ms.
Below are the recommended component values to ensure
R1 should be greater than 100 ; recommended value of
10 k
1.5 k
R4
R5
C1
47 nF
. R1 can be up to 500
300 V pulse decaying exponentially to 30 V in 300 ms
100 , C1
1.0 k , R4
4.7 k
4.7 k
47 uF
C2
R2
R3
470 nF
68 k
47 k
47 F
4.7 k , R5
, but in this case the t b2v
4.7 k
MC33197
Application Information
the following external components values:
Diagram and Typical Application).
10.8 ms
x 100e–9 = 3.41 ms
x 100e–9 = 2.66 ms
(INT connected to Gnd)
(INT connected to V bb )
3.41 ms = 13.6 ms
2 x 4 x 3.41 ms = 27.3 ms
The following is an example of timing calculations using
R2 = 22 k , R3 = 2.2 k , C2 = 100 nF (Referring to Block
Oscillator Time Base Calculation:
t b1 duration = t b1 x 4 x R2 x C2 = 1 x 4 x 27e3 x 100e–9 =
t b2 duration_g (INT to Gnd) = t b2g x R3 x C2 = 15.5 x 2.2e3
t b2 duration_v (INT to V bb ) = t b2v x R3 x C2 = 12.1 x 2.2e3
Intermittent timing calculation:
T3 = 16 x 4 x t b1 duration = 16 x 4 x 10.8 ms = 691 ms
T4 = 144 x 4 x t b2 duration_g = 144 x 4 x 3.41 ms = 1.96 s
T4 = 144 x 4 x t b2 duration_v = 144 x 4 x 2.66 ms = 1.53 s
Wash wipe timing calculation:
T2 = 96 x 4 x t b1 = 96 x 4 x 10.8 ms = 4.15 s
T1 Debounce Time Calculation (see T1 Debounce Timing)
When oscillator is oscillating at t b1 :
T1 minimum = 4 x t b1 = 4 x 10.8 ms = 43.2 ms
T1 maximum = 2 x 4 x t b1 = 2 x 4 x 10.8 ms = 86.4 ms
When oscillator is oscillating at t b2:
T1 minimum (INT connected to Gnd, t b2g ) = 4 x t b2 = 4 x
T1 maximum (INT connected to Gnd, t b2g ) = 2 x 4 x t b2 =
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