L9788 datasheet(55/264 Pages) STMICROELECTRONICS

Part #	L9788

Description	Multifunction IC for automotive engine management system

PDF	264 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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55 / 264 page

DS12308 Rev 4

55/264

L9788

Watchdog

263

Note:

These clock-tolerances have to be taken into account additionally.

As output (open drain):

5.5 V ≤ VB_IN ≤ 18 V, Tj -40 to 175 °C unless otherwise specified;

As input:

5.5 V ≤ VB_IN ≤ 18V, 4.75 V ≤ VDD_IO ≤ 5.25 V Tj -40 to 175 °C unless otherwise specified;

Table 23. WDA circuit electrical characteristic

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

WDA_UV_LO

Output low voltage

1 < VDD5 < VDD_UV

Rreset = 4.7 kΩ

--0.6

WDA

WDA_IUVres_max Input current

VDD5 = VDD_UV

VUV_reset = 0.6 V

WDA

WDA_IlkUV_reset

Input leakage current

VUV_reset> VDD_UV

µA

WDA

Table 24. WDA reset circuit electrical characteristic

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

WDA_RST_L WDA input low voltage

-0.3

1.1

WDA

WDA_RST_H WDA input high voltage

2.3

VDD_IO

+0.3

VWDA

WDA_Trst_flt WDA Reset filter time

Tested by scan

µs

WDA

WDA pull up external

resistor

Application note,

parameter not tested

250

kΩ

WDA

L9788 Datasheet(PDF) 55 Page - STMicroelectronics

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