ST24LW21M6TR(1999) Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Fabricante

ST24LW21M6TR
(Rev.:1999)

1 Kbit (x8) Dual Mode Serial EEPROM for VESA PLUG & PLAY

STMicroelectronics 

ST24LC21B, ST24LW21, ST24FC21, ST24FW21

Figure 13. Recommended Schematic for VESA 2.0 Specification

+5V

SCL

SDA

VSync

9

+5V Monitor

47kΩ

VCC

15

SCL

100nF

12

SDA

14

VCLK

VSS

HOST

VGA Cable

MONITOR

AI01749

NOTE CONCERNING THE POWER SUPPLY

VOLTAGE IN THE VESA 2.0 SPECIFICATION

According to the VESA 2.0 specification, the

ST24xy21 can be supplied by either the MONITOR

or by the HOST (using +5V on the VGA cable pin

9) power supply. The easyest way to implement this

is to use 2 diodes as described in the following

schematic. The ST24xy21 supply voltage will be

decreased by 0.6V, which is the diode forward

voltage drop, and will be below 4.5V. Nevertheless,

the ST24xy21 remains operational and no input will

be damaged if the applied voltage on any input

complies with the Absolute Maximum Ratings val-

ues.

Under this condition, the threshold voltage of the

Schmitt-Trigger (pin 7) will be decreased (as in

Table 6).

Refer to the AN627 Application Note for more de-

tailed information regarding the use and the protec-

tion of the ST24xy21 in a Monitor application.

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