ST92250R2TB View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST92250R2TB

8/16-BIT SINGLE VOLTAGE FLASH MCU FAMILY WITH RAM, E³ ™ (EMULATED EEPROM), CAN 2.0B AND J1850 BLPD

STMicroelectronics 

ST92F124/F150/F250 - ELECTRICAL CHARACTERISTICS

WATCHDOG TIMING TABLE

(VDD = 5V ± 10%, TA = –40°C to +125°C, CLoad = 50pF, fINTCLK = 24MHz, Push-pull output configuration,

unless otherwise specified)

N° Symbol

Parameter

1 TwWDOL WDOUT Low Pulse Width

2 TwWDOH WDOUT High Pulse Width

3 TwWDIL

4 TwWDIH

WDIN High Pulse Width

WDIN Low Pulse Width

Value

Formula

Unit

Min

Max

167

ns

4 x (Psc+1) x (Cnt+1) x Tck

2.8

s

(Psc+1) x (Cnt+1) x TWDIN

333

ns

167

ns

4 x (Psc+1) x (Cnt+1) x Tck

2.8

s

(Psc+1) x (Cnt+1) x TWDIN

333

ns

≥ 4 x Tck

167

ns

≥ 4 x Tck

167

ns

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 VOH or VIH for positive pulses and VOL or VIL for negative pulses.

Legend:

Tck = INTCLK period = Crystal Oscillator Clock period when CLOCK1 is not divided by 2;

2 x Crystal Oscillator Clock period when CLOCK1 is divided by 2;

Crystal Oscillator Clock period x PLL factor when the PLL is enabled.

Psc = Watchdog Prescaler Register content (WDTPR): from 0 to 255

Cnt = Watchdog Couter Registers content (WDTRH,WDTRL): from 0 to 65535

TWDIN = Watchdog Input signal period (WDIN), TWDIN ≥ 8 x Tck

WATCHDOG TIMING

390/429

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