Datasheet > BU9882-E2

BU9882-E2

更新时间： 2022-12-01 22:30:05

品牌	Logo	应用领域
罗姆 - ROHM		可编程只读存储器电动程控只读存储器电可擦编程只读存储器光电二极管
页数	文件大小	规格书
17页	812K
描述
EEPROM, PDIP14, DIP-14

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中文翻译

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数据手册

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BU9882-E2 数据手册

●I/O Circuit

○SDA Pin Pull-up Resister

The pull up resister is needed because SDA is NMOS open drain. Choose the correct value of this resister(RPU), by

considering VIL, IL characteristics of a controller which control the device and VOH, IOL characteristics of the device. If

large RPU is chosen, clock frequency needs to be slow. In case of small RPU, the operating current increases.

○Maximum Rpu

Maximum value of RPU is determined by following factors:

①SDA rise time determined by RPU and the capacitance of bus line(CBUS) must be less than tR.

Other timing must keep the conditions of AC spec.

②When SDA bus is High, the voltage A of SDA bus determined by a total input leak(IL) of the all devices connected to

the bus. RPU must be significantly higher than the High level input of a controller and the device, including a noise

margin 0.2VCC.

MICRO

COMPUTER

VCC-ILRPU-0.2 VCC ≧ VIH

CC IH

0.8V -V

RPU

∴

≦

SDA PIN

Examples: When VCC=3V IL=10μA VIH=0.7VCC

According to ②

0.8×3-0.7×3

10×10^-6

≦

THE CAPACITANCE OF

BUS LINE (CBUS)

［kΩ］

300

≦

○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.

Fig.32 I/O Circuits

CC OL

-V

≦ I

CC OL

-V

∴

≧

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 the EEPROM is VIL=0.3VCC,

3-0.4

3×10 ^-3

According to ①

≧

［

］

≧ 867

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.

14/16

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