BU9829GUL-W ROHM Co. Ltd., BU9829GUL-W Datasheet - Page 3

• Manufacturer Part Number: BU9829GUL-W
• Description: Cmos 16kbit Serial Eeprom Built-in Ldo Regulator
• Manufacturer: ROHM Co. Ltd.

◇ Input Power Supply Regulation Timing
◇ I/O APPLICATION CIRCUIT
◇CAUTIONS ON USE
(1) Absolute maximum ratings
(2) GND electric potential
(3) Heat design
(4) Terminal to terminal shortcircuit and wrong packaging
(5) Strong electromagnetic field
①Using EEPROM PART
Pull up resistor is indispensable condition.
When CSB is "H" during power ON/OFF, error operating and writing is protected.
○PULL UP RESISTOR OF CSB PIN
The pull up resistor is needed in order to prevent error operating and writing from happening.
Decide the value of this resistor (Rup) properly, considering VOH, IOH characteristics of controller.
②Using LDO REGULATOR PART
・VILE:VIL specification of EEPROM
・VOLM:VOL specification of CONTROLLER
・IOLM:IOL specification of CONTROLLER
Fig.3 PULL UP RESISTOR OF CSB
PIN
In case of using EEPROM part, be sure to raise Vcc1 up to operating voltage. In this time,
Vcc2 has no connection with operating.
In case of using LDO regulator part, be sure to raise Vcc1 and Vcc2 up to operating voltage.
After rising Vcc1, wait 15msec and rising LDOEN. When LDOEN is raised, Vcc1 must be operating voltage.
If the absolute maximum ratings such as impressed voltage and operating temperature range and so forth are exceeded,
LSI may be destructed. Do not impress voltage and temperature exceeding the absolute maximum ratings. In the case
of fear exceeding the absolute maximum ratings, take physical safety countermeasures such as fuses, and see to it
that conditions exceeding the absolute maximum ratings should not be impressed to LSI.
Set the voltage of GND terminal lowest at any action condition. Make sure that each terminal voltages is lower than
that of GND terminal.
In consideration of permissible dissipation in actual use condition, carry out heat design with sufficient margin.
When to package LSI onto a board, pay sufficient attention to LSI direction and displacement. Wrong packaging
may destruct LSI. And in the case of shortcircuit between LSI terminals and terminals and power source, terminal
Use in a strong electromagnetic field may cause malfunction, therefore, evaluated design sufficiently.
and GND owing to foreign matter, LSI may be destructed.
μｰCOM
“L” OUTPUT
VOLM
Vcc1
EEPROM Power Supply
Vcc2
LDO regulator Power
Supply
Vcc2
LDO regulator
Power Supply
Vcc1
EEPROM
Power Supply
IOLM
Vcc1
EEPROM部電源
Vcc2
LDOレギュレータ部電源
LDOEN
“L” INPUT
VILE
EEPROM
Not
Operating
動作不可
tVcc1:MAX5msec
Not Operating
Fig.5 Using LDO REGULATOR Part, Regulation Timing
Fig.4 Using EEPROM Part, Regulation Timing
tLDOEN:MIN15msec
EEPROM動作可能範囲
Operating
Operating
∴ Rpu ≧ 2.5[kΩ]
Example) When Vcc=5V, VILE=1.5V, VOLM＝0.4V,
動作不可
Not
Operating
If the Rpu is under the conditions of the equation ①,
VOLM is 0.4V or more.
If the Rpu is under the conditions of the equation ②,
VILE(=1.5V) is VOLM or less.
Not operating
tVcc1:MAX5msec
Rpu ≧
Rpu ≧
VILE ≧ VOLM
REV. A
tLDOEN:MIN15msec
EEPROM動作可能範囲
IOLM=2mA, according to ①,
Operating
Operating
VCC－VOLM
5－0.4
2×10-3
IOLM
Not Operating
Not
Operating
動作不可
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