BU9882F-W Ver la hoja de datos (PDF) - ROHM Semiconductor

Número de pieza

componentes Descripción

Fabricante

BU9882F-W

EDID Memory (For display)

ROHM Semiconductor 

BR24C21xxx Series (1K)

Datasheet

○Minimum RPU

The minimum value of RPU is determined by following factors:

①Meets the condition that VOLMAX=0.4V, IOLMAX=3mA when the output is Low.

VCC-VOL

RPU

≦ IOL

∴ RPU ≧

VCC-VOL

IOL

② VOLMAX=0.4V must be lower than the input Low level of the microcontroller and the EEPROM

including the recommended noise margin of 0.1VCC.

VOLMAX ≦ VIL-0.1 VCC

Examples: VCC=3V, VOL=0.4V, IOL=3mA, the VIL of the controller and

According to ①

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the EEPROM is VIL=0.3VCC,

and

VOL=0.4［V］

VIL=0.3×3

=0.9［V］

so that condition② is met

○SCL Pin Pull-up Resister

When SCL is controlled by the CMOS output the pull-up resistor at SCL is not required.

However, should SCL be set to Hi-Z, connection of a pull-up resistor between SCL and VCC is recommended.

Several kΩ are recommended for the pull-up resistor in order to drive the output port of the microcontroller.

●Notes For Power Supply

VCC rises through the low voltage region in which the internal circuit of the IC and the controller are unstable. Therefore, the

device may not work properly due to an incomplete reset of the internal circuit. To prevent this, the device has a P.O.R. and

LVCC feature. At power up, maintain the following conditions to ensure functions of P.O.R and LVCC.

1. "SDA='H'" and "SCL='L' or 'H'".

2. Follow the recommended conditions of tR, tOFF, Vbot for the P.O.R. function during power up.

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3. Prevent SDA and SCL from being "Hi-Z".

In case conditions 1 and/or 2 cannot be met, take following

actions:

A)If unable to keep condition 1 ( SDA is "Low" during power

up):

Recommended conditions of tR, tOFF, Vbot

tR

tOFF

Vbot

Below 10ms

Above 10ms

Below 0.3V

Below 100ms Above 10ms

Below 0.2V

→Control SDA ,SCL to be "High" as shown in figure below.

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B)If unable to keep condition 2.

→After power becomes stable, execute software reset. (See Figure 13.)

C)If unable to keep both conditions 1 and 2.

→Follow the instruction A first, then the instruction B.

●LVCC Circuit

LVCC circuit inhibits write operation at low voltage, and prevents an inadvertent write. Write operation is inhibited below the

LVCC voltage (Typ.=1.2V).

●Vcc NOISE Figure 18.

○Bypass Condenser

Figure 19.

Noise and surges on power line may cause abnormal function. It is recommended that the bypass condensers (0.1µF) are

attached on the Vcc and GND line beside the device. It is also recommended to attach bypass condensers on the board

close to the connector.

●Notes for Use

1) Described numeric values and data are design representative values, and the values are not guaranteed.

2) We believe that application circuit examples are recommendable, however, in actual use, confirm characteristics further

sufficiently. In the case of use by changing the fixed number of external parts, make your decision with sufficient margin in

consideration of static characteristics and transition characteristics and fluctuations of external parts and our LSI.

www.rohm.com

© 2012 ROHM Co., Ltd. All rights reserved.

TSZ22111・15・001

10/18

TSZ02201-0R2R0G100270-1-2

10.Jul.2012 Rev.001

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