L9777 datasheet(8/25 Pages) STMICROELECTRONICS

Part #	L9777

Description	High precision output voltage

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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Block diagrams and pins configuration

L9777

8/25

DocID13496 Rev 4

6

I

WD_EN

Watchdog function enable/disable

OPTION A: If this pin is low the watchdog function is disabled, if

connected to VCC or left floating the watchdog function is

enabled.

OPTION B & C: If this pin is low or floating, the watchdog

function is disabled, if connected to VCC the watchdog function is

enabled.

7I

VI

Input voltage

Block to GND with a capacitor of value at least 100 nF

8

I

TIMING

OPTION A & B: RESET filter time

External cap on this pin sets the delay time between NMI and

RESET output

OPTION C: not used and should be left floating or shorted to

ground.

9

O

VCC

Voltage regulator output

External cap CVCC

220 nF is needed to stabilize the regulator

10

O

VDD

Output regulated voltage switched on/off by VDD_EN pin.

External cap CVDD=100 nF is needed to stabilize the regulator

11

GND

Ground

12

I

RADJ

VCC under voltage Threshold Adjustment

By connecting this pin to an external resistor divider vs. VCC, is

possible to set the VCC under voltage threshold.

If this pin is connected to GND the under voltage threshold is set

by internal circuit.

Table 2. Pin description (continued)

Pin#

I/O

Name

Function

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