L9777C datasheet(7/25 Pages) STMICROELECTRONICS

7 / 25 page

L9777

Block diagrams and pins configuration

Doc ID 13496 Rev 2

7/25

Figure 5.

Package pin configuration (option C)

Table 2.

Pin description

Pin#

I/O

Name

Function

RESET/VDD_LOW

OPTION A & B: RESET output.

This pin is set low if NMI output goes low for adjustable filter time

OPTION C: VDD_LOW output

This pin is set low when undervoltage on VDD is detected

NMI

Non maskable Interrupt Output

This pin is set low when low voltage on VCC is detected or

frequency of WD signal is too low.

NMI/RESET power up delay.

External cap on this pin sets the time response of the VCC low

voltage detector and the time response of the watchdog monitor.

VDD_EN

VDD control.

OPTION A: If this pin is low VDD output voltage is not available

(connect this pin to VCC or left floating to switch on VDD output

voltage)

OPTION B & C: If this pin is low or left floating VDD output

voltage is not available (connect this pin to VCC to switch on VDD

regulator)

Watchdog input.

If the frequency at this input pin is too low, the NMI output is

activated low

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.

Input voltage

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

VDD_LOW

NMI

VDD_EN

WD_EN

N.C.

VCC

VDD

GND

RADJ

PinConfC

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