Datasheet RN5T652 Datasheet (RICOH)

Charge-Pump for White LED and Power Supply

RN5T652

Development Specifications

Rev. 1.5

2009.05.19

RICOH COMPANY, LTD.

Electronic Devices Company

This specification is subject to change without notice.

RN5T652 Rev.1.5

Table of Contents

1.

Outline ..................................................................................................................................................... 3

2. Feature ..................................................................................................................................................... 3

3. Pin Configuration ..................................................................................................................................... 4

4. Block Diagram.......................................................................................................................................... 5

5. Pin Description ......................................................................................................................................... 6

6. Functional Blocks ..................................................................................................................................... 7

6.1 Regulators.............................................................................................................................................. 7

6.1.1 LDO1 Electrical Characteristics ................................................................................................................ 7

6.1.2 LDO2 Electrical Characteristics ................................................................................................................ 8

6.2 Thermal Shutdown Circuit....................................................................................................................... 9

6.2.1 Thermal Shutdown Block Diagram ........................................................................................................... 9

6.2.2 Thermal Shutdown Explanation of Operation...........................................................................................9

6.2.3 Thermal Shutdown Electrical Characteristics............................................................................................ 9

6.3 Charge Pump........................................................................................................................................ 10

6.3.1 Block Diagram......................................................................................................................................... 10

6.3.2 Operation ................................................................................................................................................. 11

6.3.3 Protection Circuit..................................................................................................................................... 12

6.3.4 Unused DIN_ Pin..................................................................................................................................... 12

6.3.5 Soft-start .................................................................................................................................................. 12

6.3.6 Charge Pump Electrical Characteristics................................................................................................... 13

6.3.7 STBB Logic Input ................................................................................................................................... 14

6.4 UVLO (Under Voltage Lock Out).......................................................................................................... 14

6.5 CPU Interface....................................................................................................................................... 15

6.5.1 Start and Stop Condition.......................................................................................................................... 15

6.5.2 Data Transmission and its Acknowledge................................................................................................. 16

6.5.3 I2C -Bus Slave Address........................................................................................................................... 16

6.5.4 Data Transmission Write Format............................................................................................................. 17

6.5.5 Internal Register Write-in Timing ........................................................................................................... 17

6.5.6 Connection of I2C-Bus............................................................................................................................ 18

6.5.7 AC Characteristics of I2C-Bus ................................................................................................................ 19

7. Register .................................................................................................................................................. 20

7.1 Register Map........................................................................................................................................ 20

7.2 Main / Sub / Flash / Strobe Luminance ................................................................................................... 21

RN5T652 Rev.1.5

7.3 LDO1 / LDO2 Output Voltage ............................................................................................................... 22

7.4 Others Function.................................................................................................................................... 22

8. Electrical Characteristics........................................................................................................................ 23

8.1 Absolute Maximum Ratings .................................................................................................................. 23

8.2 Recommendation of Operation Conditions.............................................................................................. 23

8.3 General Characteristics.......................................................................................................................... 23

8.4 DC Characteristics ................................................................................................................................24

9. Additional Application Circuit................................................................................................................ 25

10. Package Information .............................................................................................................................. 27

Page 2

RN5T652 Rev. 1.5

1. Outline

RN5T652 contains constant frequency charge pump to optimize for white LED application and two low-noise LDOs.

Output enable/disable, LEDs current setting and LDO output voltage setting are individually controllable through I2C.

2. Feature

z Power Supply Function

9 LDO × 2 (ON/OFF programmable) 9 Over current Protection (All Regulators) and thermal shutdown

z White LED Charge Pump

9 Current capability: All currents capability 450mA 9 Flash at 300mA max. 9 Four Main LEDs at 25mA max. 9 Two Sub LEDs 25mA max.

z I2C-Bus (Max: 400kHz)

9 Address = 64h 9 ON/OFF control 9 Individual LEDs current value setting 9 Individual LDOs voltage value setting

z Others

9 Soft-start circuit 9 Short-circuit protection, open-circuit and thermal protection

z Package

9 28pin thin QFN package (Body size: 4 x 4 x 0.8mm)

z Process

9 CMOS process

RN5T652 Rev. 1.5

3. Pin Configuration

(TOP VIEW)

DIN3 DIN2 DIN1

VOUT

C1P C2P

C2M

GND1

DIN5

DIN4

28

27

26

DIN6

25

1 2 3 4

RN5T652 5 6 7

10

C1M

VIN1

11

VEN

9

8

PGND1

DIN7

24

12

STBB

GND2

23

13

SCL

VREF

22

14

SDA

LDOUT1

21

VIN3

20

LDOUT2

19

N.C.

18

N.C.

17

N.C.

16

N.C.

15

QFN0404-28 pin

Pin No. Name Pin No. Name Pin No. Name Pin No. Name

1 DIN3 8 PGND1 15 N.C. 22 VREF

2 DIN2 9 C1M 16 N.C. 23 GND2

3 DIN1 10 VIN1 17 N.C. 24 DIN7

4 VOUT 11 VEN 18 N.C. 25 DIN6

5 C1P 12 STBB 19 LDOUT2 26 DIN5

6 C2P 13 SCL 20 VIN3 27 GND1

7 C2M 14 SDA 21 LDOUT1 28 DIN4

Fig 3-1 Pin Configuration

RN5T652 Rev. 1.5

4. Block Diagram

VIN3

VREF

LDOUT1

LDOUT2

GND2

VEN

SCL

SDA

STBB

VREF

LDO1

LDO2

UVLO

Digital

Charge Pump

@450mA

Thermal

Shutdown

CC Driver

(Main)

5bit DAC

CC Driver (Sub)

5bit DAC

VIN1

C2P

1uF C2M

C1P

1uF C1M

VOUT

2.2uF

PGND1

DIN1

@25mA

DIN2

@25mA

DIN3

@25mA

DIN4

@25mA

DIN5

@25mA

DIN6

@25mA

4.7uF

GND

CC Driver (Flash)

5bit DAC

Fig 4-1 Block Diagram

DIN7

@300mA

GND1

RN5T652 Rev. 1.5

5. Pin Description

No. Name I/O

1 DIN3 O LED driver current control output 3

2 DIN2 O LED driver current control output 2

3 DIN1 O LED driver current control output 1

4 VOUT O LED driver voltage output

5 C1P - Charge pump boost capacitor connection

6 C2P - Charge pump boost capacitor connection

7 C2M - Charge pump boost capacitor connection

8 PGND1 - Ground (charge pump)

9 C1M - Charge pump boost capacitor connection

10 VIN1 - Power supply (charge pump)

11 VEN - Voltage supply (I2C), enable input

12 STBB I Strobe enable input

13 SCL I I2C interface clock input

14 SDA I/O I2C interface data input

15 N.C. - Non-connect

16 N.C. - Non-connect

17 N.C. - Non-connect

18 N.C. - Non-connect

19 LDOUT2 O LDO2 output

20 VIN3 - Power supply

21 LDOUT1 O LDO1 output

22 VREF O Bypass capacitor connecting pin

23 GND2 - Ground

24 DIN7 O LED driver current control output 7

25 DIN6 O LED driver current control output 6

26 DIN5 O LED driver current control output 5

27 GND1 - Ground

28 DIN4 O LED driver current control output 4

Function Notes

Table 5-1 Pin Description

RN5T652 Rev. 1.5

6. Functional Blocks

6.1 Regulators

6.1.1 LDO1 Electrical Characteristics

Operating Conditions (Unless otherwise specified) V

BATT

= 3.6V, C

= 1μF, Ta = 25℃

REFO

Symbol Parameter Condition Min Typ Max Units

VOUT1 Output Voltage

50μA＜IOUT1＜300mA

VOUT1+0.5V≦V

BATT

(VIN)≦4.5V

-2% 1.50 +2% V

IOUT1 Output Current - 300 mA

ILIM1 Current Limit VOUT1=1.5V 500 mA

VDRP1 Drop-out Voltage IOUT1=200mA, Ta =85℃ 200 mV

ΔVOUT1

ΔVIN

ΔVOUT1

ΔIOUT1

ΔVOUT1

ΔT

a

Line Regulation

Load Regulation 50μA＜IOUT1＜300mA 25 mV

Output Voltage

Temperature

Coefficient

RR1 Ripple Rejection

EN1

Output Noise

(RMS)

VOUT1+0.5V≦V

BATT

IOUT1=150mA

-40℃≦T

≦85℃ +100 ppm/℃

a

f=10Hz-10kHz, C

IOUT1=30mA

BW=100Hz-100kHz, C

IOUT1=30mA

(VIN)≦4.5V

=2.2μF

out

=2.2μF

out

2.4 mV

60 dB

35 μVrms

BC1 Bypass Capacitor 0μA＜IOUT1＜300mA 2.2 μF

ISS1 Supply Current

Normal (IOUT1=Max) 50*1

OFF 1

μA

1.50

1.80

2.50

2.60

2.80

3.00

3.10

3.30

1.85 *

+2% V

POUT1

Programmable

Output Voltage

IOUT1=300mA -2%

2.40 *

2.55 *

2.70 *

2.85 *

2.90 *

3.20 *

Table 6-1 LDO1 Electrical Characteristics

Note*: Bypass capacitor: 2.2μF, in mounted state.

For optimized phase compensation, the bypass capacitor must be the ceramic type.

RN5T652 Rev. 1.5

6.1.2 LDO2 Electrical Characteristics

Operating Conditions (Unless otherwise specified) VBATT = 3.6V, CREFO = 1μF, Ta = 25℃

Symbol Parameter Condition Min Typ Max Units

VOUT2 Output Voltage

50μA＜IOUT2＜300mA

VOUT2+0.5V≦V

BATT

(VIN)≦4.5V

-2% 1.50 +2% V

IOUT21 Output Current - 300 mA

ILIM2 Current Limit VOUT2=1.5V 500 mA

VDRP2 Drop-out Voltage IOUT2=200mA, Ta =85℃ 200 mV

ΔVOUT2

ΔVIN

ΔVOUT2

ΔIOUT2

ΔVOUT2

ΔT

a

Line Regulation

Load Regulation 50μA＜IOUT2＜300mA 25 mV

Output Voltage

Temperature

Coefficient

RR2 Ripple Rejection

EN2

Output Noise

(RMS)

VOUT2+0.5V≦V

BATT

IOUT2=150mA

-40℃≦T

≦85℃ +100 ppm/℃

a

f=10Hz-10kHz, C

IOUT2=30mA

BW=100Hz-100kHz, C

IOUT2=30mA

(VIN)≦4.5V

=2.2μF

out

=2.2μF

out

2.4 mV

60 dB

35 μVrms

BC2 Bypass Capacitor 0μA＜IOUT2＜300mA 2.2 μF

ISS2 Supply Current

Normal (IOUT2=Max) 50*1

μA

OFF 1

1.50

1.80

2.50

2.60

2.80

3.00

3.10

3.30

1.85 *

+2% V

POUT2

Programmable

Output Voltage

IOUT2=300mA -2%

2.40 *

2.55 *

2.70 *

2.85 *

2.90 *

3.20 *

Table 6-2 LDO2 Electrical Characteristics

Note*: Bypass capacitor: 2.2μF, in mounted state.

For optimized phase compensation, the bypass capacitor must be the ceramic type.

Note*1: Vref Block Supply Current typ 20μA

ex)LDO1+LDO2+Vref =120μA(typ)

LDO1+Vref=70μA(typ)

RN5T652 Rev. 1.5

6.2 Thermal Shutdown Circuit

The thermal shutdown circuit is consisted of two temperature detection circuits and an op-amp.

6.2.1 Thermal Shutdown Block Diagram

VIN

Temperature

Detection Circuit

Control Circuit

GND

Temperature

Detection Circuit

GND

To Power-on Control Circuit

Fig 6-1 Thermal Shutdown Circuit Diagram

6.2.2 Thermal Shutdown Explanation of Operation

The overheat state can be detected by comparing the output voltages from two temperature detection circuits, which

have different temperature characteristics. If the overheat state is detected, the internal POWERSW signal will fall

down to “L” and RN5T652 will turn off to protect itself from overheating.

6.2.3 Thermal Shutdown Electrical Characteristics

Operating Conditions (Unless otherwise specified) V

BATT

= 3.6V, C

= 1μF, Ta = 25℃

REFO

Symbol Parameter Condition Min Typ Max Units

T

Detected Temperature - 150 ℃

DET

T

Return Temperature - 100 ℃

RET

ISS Supply Current - 10 20 μA

Table 6-3 Thermal Shutdown Electrical Characteristics

RN5T652 Rev. 1.5

6.3 Charge Pump

RN5T652 charge pump drives up to six white LEDs and one strobe with regulated constant current for uniform

intensity.

6.3.1 Block Diagram

4.7 µ F

VIN1

GND

VEN SCL SDA STBB

Logic

C1M

1µF

C1P

Charge Pump

@450mA

ON/OFF

STBB

CC Driver (Sub)

CC Driver (Flash)

1µF

C2M

Adjust

Voltage

CC Driver

(Main)

5bit DAC

C2P

VOUT

2.2 µ F

PGND1

Feed Back

DIN1

@25mA

DIN2

@25mA

DIN3

@25mA

DIN4

@25mA

DIN5

@25mA

DIN6

@25mA

DIN7

@300mA

GND1

Fig 6-2 Charge Pump Circuit Diagram

GND

RN5T652 Rev. 1.5

6.3.2 Operation

Initial and 1x mode

When any channel is turned ON, charge pump output (VOUT) voltage becomes VIN1 voltage. In this time, Soft-start

prevents the inrush current. As a result, RN5T652 starts at 1x mode.

In 1x mode, the following relation is the condition to stay in 1x mode.

VOUT - Vf > 0.25V (1)

Here, VOUT and Vf mean output of Charge pump and forward voltage of white LED, respectively. 0.25V means mode

transition threshold, in case of setting at 25mA of Main or Sub.

1x or 1.5x transition

When the battery voltage decreases and DIN_ pin voltage becomes lower than 0.25V for 100us, RN5T652 starts

charge pump in 1.5x mode.

In 1.5x mode, the following relation is the condition to stay in 1.5x mode.

VOUT - Vf > 0.25V (2)

In 1.5x mode, CP is switched to 1x mode about every 1 sec and judge the mode whether 1x or 1.5x for 100us.

1.5x or 2x transition

When the battery voltage decreases furthermore, and DINx_ pin voltage goes down below 0.25V for 100us, RN5T652

starts 2x mode from 1.5x mode. In 2x mode, CP is switched to 1.5x mode about every 1 sec and judge the mode

whether 2x or 1.5x for 100us.

1x/1.5x/2x mode transition

RN5T652 Rev. 1.5

6.3.3 Protection Circuit

When any DIN_ pin is floating or grounded, VOUT voltage is limited below protection voltage by gating on/off charge

pump. In case any LED fails as an open circuit, VOUT voltage is also limited. Besides, when VOUT is smaller than

approximately 1.2V, charge pump also stops.

6.3.4 Unused DIN_ Pin

In case there is any unused DIN_ pin, connect DIN_ to GND to avoid over voltage protection status.

6.3.5 Soft-start

When LEDs are turned ON, to prevent the inrush current, RN5T652 has the soft-start function. (The internal resistance

gradually increases, just after LEDs enabled.)

RN5T652 Rev. 1.5

6.3.6 Charge Pump Electrical Characteristics

Unless otherwise specified VIN=3.6V, Ta=25℃, C1=C2=1uF, Cout=2.2uF

Parameter Conditions Min Typ Max Units

Charge Pump

Operating Voltage VIN1 and VIN3 voltage 2.7 4.5 V

VOUT voltage (Over voltage) Repeat On and Off in 1.5x or 2x 4.8 V

Maximum Output current VIN1=3.6V, VOUT=4.2V 450 mA

1x mode 1 Ohm

Output resistance: Ro

1.5x mode 3 Ohm

2x mode 6 Ohm

Switching Frequency - 1.25 MHz

Soft-start time - 0.18 msec

1x mode, No load, (DET, Reference ON) 0.8 mA

Supply current

1.5x mode or 2x mode 5 6 mA

Standby supply current VEN=0V, VIN1 and VIN3 current 1 uA

Current Limit VOUT shorted 50 mA

LED Driver

DIN1-6 25 mA

Maximum Sink current

DIN7 300 mA

LED current accuracy (Main, Sub) Code=1F, DIN_=0.25V -5 5 %

LED current accuracy (Flash) Code=1F, DIN7=0.4V -5 5 %

LED current matching Main or Sub, respectively*1 -5 5 %

1x to 1.5x, 1.5x to 2x transition threshold At lowest DINx pin, DIN1-6 250 mV

1x to 1.5x, 1.5x to 2x transition threshold At lowest DINx pin, DIN7 400 mV

1x to 1.5x, 1.5x to 2x transition time Chattering noise reduction 100 us

DIN1-7 leakage in shutdown - 0.01 uA

Table 6-4 Charge Pump Electrical Characteristics

Note*1: Matching is defined (Iave_ - Iled_) / Iave_. Iave_ means the average current of Main or Sub, respectively.

Matching is defined without Vf voltage difference between channels.

For Main, Iave_main = (Iled1 + Iled2 + Iled3 + Iled4) / 4

For Sub, Iave_sub = (Iled5 + Iled6) / 2

RN5T652 Rev. 1.5

6.3.7 STBB Logic Input

STBB input is used to control the flash LEDs without accessing I2C. When STBB is driven to "L", the flash LEDs are

driven by the current set in the strobe luminance register.

Driving STBB low overrides the flash LEDs set by I2C. With STBB high, the flash LEDs becomes controllable by I2C

interface.

Fig 6-3 STBB Input Diagram

6.4 UVLO (Under Voltage Lock Out)

Operating Conditions (Unless otherwise specified) C

Symbol Parameter Condition Min Typ Max Units

V

Under voltage lock out threshold VCCVIN rising 2.25 V

Release

V

Under voltage lock out threshold VCCVIN falling 2.05 2.20 2.35 V

Detect

V

UVLO Hysteresis - 50 mV

HYS

Table 6-5 UVLO Electrical Characteristics

= 1μF, Ta = 25℃

REFO

RN5T652 Rev. 1.5

6.5 CPU Interface

RN5T652 uses I2C-Bus system for CPU connection through 2-wires. Connection and transfer system of I2C-Bus are

described in the following sections.

6.5.1 Start and Stop Condition

Within the procedure of I2C-Bus, unique situations which are defined as Start and Stop conditions arise.

SCL

SDA

Fig 6-4 I2C-Bus Data Transmission

An “H” to “L” transition on SDA line while SCL is “H” indicates a Start condition. An “L” to “H” transition on SDA

line while SCL is “H” defines a Stop condition. Start and Stop conditions are always generated by master (Refer to the

figure below). The bus is considered to be busy after the Start condition. The bus is considered to be free again a certain

time after the stop condition.

Start Condition Stop Condition

SCL

SDA

Fig 6-5 I2C-Bus Start and Stop Condition

RN5T652 Rev. 1.5

6.5.2 Data Transmission and its Acknowledge

After start condition, data is transmitted by 1byte (8bits). The number of bytes that can be transmitted per transmission

is not limited. Receiver must send an acknowledge signal to the transmitter every time 8bit data is transmitted.

Data transmission must be accompanied by acknowledge signal. The acknowledge-related clock pulse is generated by

the master. The transmitter releases SDA line during the acknowledge clock pulse.

The receiver must pull down SDA line during the acknowledge clock pulse so that it remains stable “L” during “H”

period of this clock pulse.

If a master–receiver is involved in a transfer, it must signal the end of the data to the slave-transmitter by not generating

an acknowledge signal on the last byte that was clocked out of the slave. The slave-transmitter must release the data line

to allow the master to generate a Stop condition.

SCL from

Master

SDA from

Transmitter

SDA from

Receiver

Start Condition

12 89

Acknowledge Signal

Fig 6-6 I2C-Bus Data Transmission and its Acknowledge

6.5.3 I2C -Bus Slave Address

After the start condition, a slave address is sent. This address is 8 bits long followed by. The slave address of RN5T652

are specified at “0110 0100b”

A7 A6 A5 A4 A3 A2 A1 A0

Setting

value

0 1 1 0 0 1 0 0

A7～A0: Slave Address

Fig 6-7 Slave Address of RN5T652

RN5T652 Rev. 1.5

6.5.4 Data Transmission Write Format

The transmission format for the slave address allocated to each IC is defined by I2C-Bus standard. However

transmission method of address information of each IC is not defined. RN5T652 transmits data to the internal address

pointer at 1byte continue to the slave address and write command. For the data transmission, please transmit MSB first

from Master and following data in sequence. Also, Master should receive MSB first when it receives data from the

slave.

6.5.5 Internal Register Write-in Timing

SCL from Master

SDA from Master

SDA from Slave

An Internal Register

Write-in Signal (WRB)

Start Condition

Fig 6-8 Data Transmission Write Format

198765423

Acknowledge

Stop Condition

Writing to an internal register

Fig 6-9 Internal Register Write-in Timing

RN5T652 Rev. 1.5

6.5.6 Connection of I2C-Bus

2 wires of SCL and SDA are connected to I2C-Bus and used for transmitting clock pulses and data individually. All ICs

connected to these two lines are designed not to be clamped even though voltage, which exceeds its power supply

voltage, is supplied through the input and output pins. Open drain pins is for output. This construction allows

communication of signals between Ics, which have different supply voltages, by adding a pull-up resistor to each signal

line as shown in the figure below. Each IC is designed not to give any effect on SCL and SDA signal lines even though

their power is turned off individually.

VDD1

DD2

V V

DD3 DD4

V

SCL

SDA

R

P RP

Microcontroller RN5T652

*1) For data interface, the following conditions must be met : V

DD4 > VDD1

V

DD4 > VDD2

V

DD4 > VDD3

*2) When the master is one, the microcontroller is ready for

driving SCL to "H" and R

Other Periphral

IC

Fig 6-10 Connection of I2C-Bus

P of SCL may not be required.

RN5T652 Rev. 1.5

6.5.7 AC Characteristics of I2C-Bus

Operating Conditions (Unless otherwise specified) V

BATT

= 3.6V, C

= 1μF, Ta = 25℃

REFO

Symbol Parameter Condition Min Typ Max Units

f

SCL Clock Frequency - 400 kHz

SCL

t

BUF

t

SCL Clock “L” Time - 1.3 μs

LOW

t

SCL Clock “H” Time - 0.6 μs

HIGH

t

Start Condition Setup Time - 0.6 μs

SU;STA

t

Start Condition Hold Time - 0.6 μs

HD;STA

t

Stop Condition Setup Time - 0.6 μs

SU;STO

t

HD;DAT

t

Data Setup Time -

SU;DAT

Bus Free Time Between

a Precedent and Start

Data Hold Time - 0 μs

- 1.3 μs

100

*1

ns

tR Rising Time of SCL and SDA (Input) - 300 ns

tF Falling Time of SCL and SDA (Input) - 300 ns

tSP

t

VENSET

t

VENHOLD

Spike Width that can be

Removed with Input Filter

VEN to Start Condition Setup Time - 100 μs

VEN to Stop Condition Hold Time - 100 μs

- 50 ns

Table 6-6 AC Characteristics

Note*: All the above-mentioned values are corresponding to V

minimum and V

IH

maximum level.

IL

Note*1: Standard mode is allowed in I2C-Bus standard. For Standard mode, it needs to satisfy the condition;

tSU;DAT>=250ns.

t

BUF

t

HD;STA

t

VENSET

t

LOW

t

VENHOLD

t

R

t

HD;DAT

t

HIGHtF

t

SU;DAT

t

SU;STA

t

HD;STA

t

SP

t

SU;STO

VEN

SDA

SCL

PS Sr P

Fig 6-11 AC Characteristics of I2C-Bus

RN5T652 Rev. 1.5

7. Register

7.1 Register Map

SDA Control Byte

Function

COMMAND DATA

C2 C1 C0 D4 D3 D2 D1 D0

Main Luminance 31-steps 25mA / LED max. 000 00000 = off

Initial value

Flash Luminance 31-steps 300mA max, I2C enabled, 010 00000 = off

Initial value

Strobe Luminance 31-steps 300mA max, STBB enable, 011 00000 = off

Initial value

LDO1 Output Voltage x 16 steps

Initial value

LDO2 Output Voltage x 16 steps

Initial value

Sub Luminance 31-steps 25mA / LED max. 001 00000 = off

Test

0 0 0

0 0 0 0 0

0 0 1

0 0 0 0 0

0 1 0

0 0 0 0 0

0 1 1

0 0 0 0 0

1 0 0

0 0 0 0 0

1 0 1

0 0 0 0 0

1 1 0 0 0 0 0 0

Other Functions

1 1 1

Initial value

Table 7-1 Register Map

Note*: C2 is MSB, and D0 is LSB

Do not write “１”in Test Register [D4:D0].

Main

Enable

0 0 0 0 0

Sub

Enable

DIN7

Enable

LDO1

Enable

LDO2

Enable

RN5T652 Rev. 1.5

7.2 Main / Sub / Flash / Strobe Luminance

Each sink current of DIN1-4, 5, 6, and 7 can be set by the code of D4-D0.

LED Current (mA) Data

Main Sub Flash Strobe D4 D3 D2 D1 D0

off off off off 0 0 0 0 0

0.8 0.8 9.7 9.7 0 0 0 0 1

1.6 1.6 19.4 19.4 0 0 0 1 0

2.4 2.4 29.0 29.0 0 0 0 1 1

3.2 3.2 38.7 38.7 0 0 1 0 0

4.0 4.0 48.4 48.4 0 0 1 0 1

4.8 4.8 58.1 58.1 0 0 1 1 0

5.6 5.6 67.7 67.7 0 0 1 1 1

6.5 6.5 77.4 77.4 0 1 0 0 0

7.3 7.3 87.1 87.1 0 1 0 0 1

8.1 8.1 96.8 96.8 0 1 0 1 0

8.9 8.9 106 106 0 1 0 1 1

9.7 9.7 116 116 0 1 1 0 0

10.5 10.5 126 126 0 1 1 0 1

11.3 11.3 135 135 0 1 1 1 0

12.1 12.1 145 145 0 1 1 1 1

12.9 12.9 155 155 1 0 0 0 0

13.7 13.7 165 165 1 0 0 0 1

14.5 14.5 174 174 1 0 0 1 0

15.3 15.3 184 184 1 0 0 1 1

16.1 16.1 194 194 1 0 1 0 0

16.9 16.9 203 203 1 0 1 0 1

17.7 17.7 213 213 1 0 1 1 0

18.5 18.5 223 223 1 0 1 1 1

19.4 19.4 232 232 1 1 0 0 0

20.2 20.2 242 242 1 1 0 0 1

21.0 21.0 252 252 1 1 0 1 0

21.8 21.8 261 261 1 1 0 1 1

22.6 22.6 271 271 1 1 1 0 0

23.4 23.4 281 281 1 1 1 0 1

24.2 24.2 290 290 1 1 1 1 0

25.0 25.0 300 300 1 1 1 1 1

Note*: Defaults shown in Bold.

RN5T652 Rev. 1.5

7.3 LDO1 / LDO2 Output Voltage

Each output voltage of LDO1 and LDO2 can be set by the code of D3-D0. And enable/disable of the output can be

individually set by D4 bit.

LDO Voltage (V) Data

LDO1 LDO2 D3 D2 D1 D0

1.50 1.50 0 0 0 0

1.80 1.80 0 0 0 1

2.50 2.50 0 0 1 0

2.60 2.60 0 0 1 1

2.80 2.80 0 1 0 0

3.00 3.00 0 1 0 1

3.10 3.10 0 1 1 0

3.30 3.30 0 1 1 1

1.85 1.85 1 0 0 0

2.40 2.40 1 0 0 1

2.55 2.55 1 0 1 0

2.70 2.70 1 0 1 1

2.85 2.85 1 1 0 0

2.90 2.90 1 1 0 1

3.20 3.20 1 1 1 0

1.50 1.50 1 1 1 1

7.4 Others Function

Bit DATA Function

D4 Main Enable

D3 Sub Enable

D2 DIN7 Enable

D1 LDO1 Enable

D0 LDO2 Enable

Note*: The relations between each bit of the other function register and each register are AND conditions.

1 Enable

0 Disable

1 Enable

0 Disable

1 Enable

0 Disable

1 Enable

0 Disable

1 Enable

0 Disable

RN5T652 Rev. 1.5

8. Electrical Characteristics

8.1 Absolute Maximum Ratings

The operation exceeding “Absolute Maximum Ratings” below may cause permanent damage to the device.

The operation of the device within the stated ratings below is not guaranteed.

Symbol Parameter Condition Rated value Units

VIN1

VIN3

VEN Power Supply Voltage - -0.3～4.5 V

ＶＩＮ Input Voltage Range All Input Pins -0.3～VEN+0.3 V

PD

T

Storage Temperature - -55～+125 ℃

stg

Power Supply Voltage Battery Voltage Input Pins -0.3～6.0 V

Package

Allowable Dissipation

Mounted on Board,

T

=70℃

a

1826 mW

8.2 Recommendation of Operation Conditions

Symbol Parameter Condition Min Typ Max Units

VIN Power Supply Voltage1 Battery Voltage Input Pins 2.7 3.6 4.5 V*

VEN Power Supply Voltage - 1.8 2.85 3.6 V

Ta Temperature of Operation - -40 +85 ℃

Note*: For safety operation of RN5T652, VEN pin should be connected to constant voltage source

in the recommended input voltage.

8.3 General Characteristics

Symbol Parameter Condition Min Typ Max Units

ISSVEN VEN Supply Current SCL=SDA=STBB=VEN 1 μA

ISHUT

Shutdown Supply Current

(All output off)

VEN=3.0V, I2C ready,

TA=25℃

VEN=0V, I2C off, TA=25℃ 1

3

μA

RN5T652 Rev. 1.5

8.4 DC Characteristics

Digital Part Input

(Input pin) SCL, SDA, STBB

Operating Conditions (Unless otherwise specified) V

BATT

= 3.6V, C

= 1μF, Ta = 25℃

REFO

Symbol Parameter Condition Min Typ Max Units

VIH “H” Input Voltage -

VIL “L” Input Voltage -

VEN

x 0.7

V

VEN

x0.3

V

VOL “L” Output Voltage IOL=-3mA 0.3 V

IIL Input Leakage Current V=0～VEN -3 3 μA

IOZ Off Leakage Current V=0～VEN -3 3 μA

Terminal equivalent circuit

Fig 8-1 Terminal Equivalent Circuit

RN5T652 Rev. 1.5

9. Additional Application Circuit

(1) Dual Main 4 LEDs and Sub 2 LEDs

(2) Mono 5 LEDs

Fig 9-1 Dual Main 4 LEDs and Sub 2 LEDs

Note*: Please connect DIN6 to GND.

Fig 9-2 Mono 5 LEDs

RN5T652 Rev. 1.5

(3) Dual Main 3 LEDs and Sub 2 LEDs

VOUT

PGND1

DIN1 DIN2 DIN3 DIN4

DIN5 DIN6

DIN7

GND1

Li-ion Battery

GPIO1

GPIO2

CPU

GPIO3

GPIO4

VIN1

C1P

1μF

C1M

4.7uF

C2P

1μF

C2M

VCPUP

VEN

SCL

SDA

STBB

MONO 4 LEDs

Note*: Please connect DIN4 to GND.

2.2μF

Control flow chart

Main LED Sub LED Flash

Start

GPIO1 ⇒“H”

Transmission

SDA=(0,0,0,1,1,1,1,1)

Transmission

SDA=(0,0,1,1,1,1,1,1)

Transmission

SDA=(1,1,1,1,0,x,x,x)

Transmission

SDA=(1,1,1,0,1,x,x,x)

Transmission

SDA=(1,1,1,1,1,x,x,x)

GPIO1 ⇒“L”

Stop

Fig 9-3 Dual Main 3 LEDs and Sub 2 LEDs

(RN5T652 Enable)

(Main LEDs Setting 25mA )

(Sub LEDs Setting 25mA )

(Main LEDs ON / Sub LEDs OFF)

(Main LEDs OFF / Sub LEDs ON)

(Main LEDs ON / Sub LEDs ON)

(RN5T652 Sleep Main/Sub LEDs OFF)

x: Don't care

(4) Mono 4 LEDs

Control flow chart

Start

GPIO1 ⇒“H”

Transmission

SDA=(0,0,0,1,1,1,1,1)

SDA=(1,1,1,1,0,x,x,x)

Transmission

SDA=(1,1,1,0,0,x,x,x)

Transmission

GPIO1 ⇒“L”

Stop

(RN5T652 Enable)

(Main LEDs Setting 25mA )

(Mono 4 LEDs ON)

(RN5T652 Sleep Mono 4 LEDs OFF )

x: Don't care

Li-ion Battery

GND

GPIO1

GPIO2

CPU

GPIO3

GPIO4

4.7uF

VCPUP

VIN1

C1P

1μF

C1M

C2P

1μF

C2M

VEN

SCL

SDA

STBB

VOUT

2.2μF

PGND1

DIN1

DIN2

DIN3

DIN4

DIN5

DIN6

DIN7

GND1

Flash

GND

Note*: When DIN5 and 6 are not used, write “0” in D3 (Sub Enable) bit of the other function register always or

connect DIN5 and DIN6 to GND.

Fig 9-4 Mono 4 LEDs

RN5T652 Rev. 1.5