ST92141 STMicroelectronics, ST92141 Datasheet - Page 164

• Manufacturer Part Number: ST92141
• Description: 8/16-bit Mcu For 3-phase Ac Motor Control
• Manufacturer: STMicroelectronics

ST92141 - ELECTRICAL CHARACTERISTICS
WATCHDOG TIMING TABLE
(V
unless otherwise specified)
Note: The value in the left hand column shows the formula used to calculate the timing minimum or maximum from the oscillator clock period,
watchdog prescaler and counter programmed values.
The value in the right hand two columns show the timing minimum and maximum for an internal clock (INTCLK) at 25MHz, with minimum and
maximum prescaler value and minimum and maximum counter value.
Measurement points are taken with reference to V
(1) Formula guaranteed by design.
Legend:
Tck = INTCLK period = OSCIN period when OSCIN is not divided by 2;
Psc = Watchdog Prescaler Register content (WDTPR): from 0 to 255
Cnt = Watchdog Counter Registers content (WDTRH,WDTRL): from 0 to 65535
T
WATCHDOG TIMING
164/179
N°
WDIN
1
2
3
4
DD
1
= Watchdog Input signal period (WDIN)
= 5V
TwWDOL
TwWDOH
TwWDIL
TwWDIH
Symbol
10%, T
OSCIN period x PLL factor when the PLL is enabled.
2 x OSCIN period when OSCIN is divided by 2;
WDOUT Low Pulse Width
WDOUT High Pulse Width
WDIN High Pulse Width
WDIN Low Pulse Width
A
=
–
40°C to +85°C, C
Parameter
IH
-V
IH
Load
/ V
OH
-V
= 50pF, f
OH
for positive pulse and V
4 x (Psc+1) x (Cnt+1) x Tck
4 x (Psc+1) x (Cnt+1) x Tck
(Psc+1) x (Cnt+1) x T
(Psc+1) x (Cnt+1) x T
with T
with T
INTCLK
Formula
4 x Tck + 10
4 x Tck +10
WDIN
WDIN
= 25MHz, Push-pull output configuration,
8 x Tck
8 x Tck
(1)
Value (Note)
IL
-V
WDIN
WDIN
IL
/ V
OL
-V
OL
for negative pulse
Min
160
320
160
320
170
170
Max
2.69
2.69
Unit
ns
ns
ns
ns
ns
ns
s
s