R5310L007B Ver la hoja de datos (PDF) - RICOH Co.,Ltd.

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R5310L007B

Multi LDOs for Cellular-phone

RICOH Co.,Ltd. 

1-8. Operation after Interrupt Procedure

In the case that CSB input becomes to high by interrupting while a command-set which has not yet been acknowledged, the

command-set is disabled by internal reset signal, therefore, after this case, transaction should be executed from the initial

condition.

2. Voltage Regulators

Embedded 8 regulators are classified into 4 groups as follows by their characteristics:

[High Speed Type] VR1, 2, 5, 7

With High ripple rejection (Typ. 65dB at 1kHz) and Low Noise, they are suitable for RF and analog circuits.

And the load transient response is also good, therefore they are recommendable for DSP which requires fast dynamic

response to load current.

[Adjustable Output Voltage Type] VR3, 4

They include 8-bit D/A converter (guaranteed monotonous increase) each, users can select output voltage in a range by 3-

wire serial interface control. They are suitable for various applications which do not require much load current (Max.

20mA), such as PA bias, AGC, LCD luminance adjuster and can be used as voltage references.

[Boost Type] VR6

VR6 is used with an external PNP transistor and can supply large output current. This regulator is always ON, therefore

its supply current is enough minimized to save invalid current by design (Typ. 6µA).

[For Vibrator] VR8

VR8 can drive a vibrator (which requires 1.3V as a supply voltage) directly.

3. Voltage Detectors

VD1 monitors the voltage of VR6, when the voltage becomes lower than setting detector threshold voltage, DOUT1 pin becomes

“L”, and internal logic is initialized, furthermore does not accept input signal. It is suitable for reset CPU. Output type is Nch

open drain and pull-up resistance to VR6. Setting output delay time (Reset Released Delay Time) is possible with connecting

an external capacitance to CD pin. The formula which shows the relation between External capacitance value (CD) and output

delay time is as follows:

tD=0.67×106×CD

VD2 monitors VDD voltage, when the voltage becomes lower than setting output voltage threshold, DOUT2 becomes “L”, and

disables VR6. It is suitable for detecting cutting off a battery voltage in a flash and can be used to set a operation starting

voltage. Output Type is CMOS and its “H” level equals to voltage of ROUT6.

VD3 monitors also VDD voltage, when the voltage becomes higher than setting output threshold, VD3 disables VR6. It is

necessary to protect circuits from large input voltage.

VD4 monitors the voltage of VR6, when the voltage becomes higher than setting output threshold, it disables VR6 and protect

a coin battery for backup. When ROUT6 is equal or less than setting output threshold, VR6 turns on again. Thus, the operation is

repeated until VR6 outputs normal voltage.

4. Ringer Controller

Ringer controller is composed with an external PNP transistor. It can control a Ringer in the range from 6Ω to 32Ω.

By 3-wire interface controller, ON and OFF, 3bit electrical volume can be controlled. The Output is also controlled to accept

“ON” command and input signal of TONE pin via 3-wire interface, thus it can generate any melody. Output condition via 3-

wire interface controller inputs and TONE input is shown below:

3-wire input

0 (OFF)

1 (ON)

1 (ON)

TONE input

0 or 1

0

1

Ringer Output

OFF

OFF (standby)

ON

Supply Current (for Ringer Controller Circuit Part)

(almost 0µA)

(approximately 500µA)

(approximately 100µA (only for internal circuit))

Rev.1.10

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