ST92F150-EVAL STMicroelectronics, ST92F150-EVAL Datasheet - Page 390

• Manufacturer Part Number: ST92F150-EVAL
• Description: BOARD EVALUATION FOR ST9 SERIES
• Manufacturer: STMicroelectronics

Specifications of ST92F150-EVAL

• Processor To Be Evaluated: ST90158 and ST92F1x Daughter Board
• Interface Type: I2C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 497-2905

ST92F124/F150/F250 - 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 24MHz, with minimum and
maximum prescaler value and minimum and maximum counter value.
Measurement points are V
Legend:
Tck = INTCLK period = Crystal Oscillator Clock period when CLOCK1 is not divided by 2;
Psc = Watchdog Prescaler Register content (WDTPR): from 0 to 255
Cnt = Watchdog Couter Registers content (WDTRH,WDTRL): from 0 to 65535
T
WATCHDOG TIMING
390/429
1
N°
WDIN
1
2
3
4
DD
= Watchdog Input signal period (WDIN), T
= 5V ± 10%, T
TwWDOL
TwWDOH
TwWDIL
TwWDIH
Symbol
2 x Crystal Oscillator Clock period when CLOCK1 is divided by 2;
Crystal Oscillator Clock period x PLL factor when the PLL is enabled.
WDOUT Low Pulse Width
WDOUT High Pulse Width
WDIN High Pulse Width
WDIN Low Pulse Width
A
OH
=
or V
–
40°C to +125°C, C
IH
for positive pulses and V
Parameter
WDIN
≥ 8 x Tck
Load
OL
= 50pF, f
or V
IL
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
for negative pulses.
INTCLK
Formula
≥ 4 x Tck
≥ 4 x Tck
= 24MHz, Push-pull output configuration,
Value
WDIN
WDIN
Min
167
333
167
333
167
167
Max
2.8
2.8
Unit
ns
ns
ns
ns
ns
ns
s
s