AS3630-ZWLT

AS3630 8A Supercap Flash Driver General Description The AS3630 is an inductive high efficient 4MHz dual DCDC step up converter with several sources. It supports the charging of a Supercap, its voltage balancing and a highly efficient DCDC step up from the Supercap to the LED and from VIN to the LED to power the flash LED with up to 8A. The AS3630 supports the pre-charging of the Supercap (to VIN) to reduce the startup time for the flash without reducing the lifetime of the Supercap. The system concept supports an immediate torch function without first charging the Supercap. The AS3630 includes flash timeout, over- undervoltage, overtemperature and LED short circuit protection. The AS3630 is controlled by an I²C interface for adjustment of the currents and timings, set the end of charge voltage and measure the Supercap and LED parameters through the internal ADC. A dedicated TXMASK/TORCH input can be used for a torch button -or- reducing the battery current if a RF PA is operated at the same time (TX Masking). A hardware enable pin -ON can be used as a reset input. The AS3630 is available in a space-saving WL-CSP 5x5 balls package measuring only 2.5x2.5x0.6mm and operates over the -30ºC to +85ºC temperature range. Figure AS3630 – 1: Key Benefits and Features Benefits Features Reduce Supercap size Dual high efficiency boost converter with soft start allows small coils Instantaneous Torch operation for improved user experience Immediate Torch functions with charging of the Supercap Tiny external coils 4MHz fixed frequency DCDC System Safety 10bit ADC converter for system monitoring with Protection functions: Automatic Flash Timeout timer to protect the LED Overvoltage and undervoltage Protection LED (NTC) and device Overtemperature Protection LED short/open circuit protection Improved thermal performance (ground = heat sink) Flash LED(s) cathode connected to ground: 8A Supercap Flash Driver AS3630 – 1 Benefits Features Fine control of current to fit to applications LED currents (fully adjustable by interface) • 8A for 33ms and 6A for 120ms (Flash), 2.9mA 272mA for torch • 1mA-8mA indicator current Full control and hardware ON pin for easier system integration I²C Interface with Interrupt output and ON pin The device is ideal for Flash/Torch for mobile phones, DSC and Tablets. Applications Figure AS3630 – 2: Typical Operating Circuit        &. ,( # 3 3 3 456  ! )*+ %&'(   !$ ! !$ /"          2*#! "-"  ! !$      )0&1  ,(& (      "    $   171  $    !  3 Typical Operating Circuit: Shows the main function blocks of the AS3630. AS3630 – 2 8A Supercap Flash Driver Pin Assignment Figure AS3630 – 3: Pin Assignments (Top View)
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! AS3630 – 3 Pin Description Figure AS3630 – 4: Pin Description Pin Number Pin Name Description A1 STROBE A2 NTC LED temperature sensor input - connect to NTC and connect its GND with a separate ground wire to AGND A3 SDA2 Digital input, open drain output - serial data input/output for I²C interface (needs external pullup resistor) A4 SCL2 Digital Input3 - serial clock input for I²C mode A5 AGND B1 VSUPERCAP B2 IND_OUT Digital input with pulldown to control strobe time for flash function1 Analog ground - connect to ground (GND) Supercap connection Indicator LED current source output B3 TXMASK/TORCH Function 1 • “TXMASK” Connect to RF power amplifier enable signal reduces currents during flash to avoid a system shutdown due to parallel operation of the RF PA and the flash driver. Function 2 • “TORCH” Operate torch current level without using the I²C interface to operate the torch without need to start a camera processor (if the I²C is connected to the camera processor. B4 ON Digital Input active high - a logic 1 enables of the AS3630; a logic 0 resets the AS3630 B5 VIN Positive supply voltage input - connect to supply and make a short connection to input capacitor CVIN and to coil LDCDC1 C1 BAL Supercap balance pin - balances both single capacitors inside the Supercap C2 SW2 DCDC converter 2 switching node - make a short connection to the coil LDCDC2 and connect all SW2 pins together on top plane C3 PGND Power ground - connect to ground (GND) and connect all PGND pins together on top plane C4 INT Open drain interrupt output - active low (needs external pullup resistor) C5 VDCDC DCDC converter 1 and 2 output capacitor - make a short connection to CVOUT1 and connect all VDCDC pins together as short as possible AS3630 – 4 8A Supercap Flash Driver Pin Number Pin Name Description D1 VDCDC DCDC converter 1 and 2 output capacitor - make a short connection to CVOUT1 and connect all VDCDC pins together as short as possible D2 SW2 DCDC converter 2 switching node - make a short connection to the coil LDCDC2 and connect all SW2 pins together on top plane D3 PGND Power ground - connect to ground (GND) and connect all PGND pins together on top plane D4 SW1 DCDC converter 1 switching node - make a short connection to the coil LDCDC1 and connect all SW1 pins together on top plane D5 LED_OUT Flash LED current source output and connect all LED_OUT pins together on top plane E1 VDCDC DCDC converter 1 and 2 output capacitor - make a short connection to CVOUT1 and connect all VDCDC pins together as short as possible E2 SW2 DCDC converter 2 switching node - make a short connection to the coil LDCDC2 and connect all SW2 pins together on top plane E3 PGND Power ground - connect to ground (GND) and connect all PGND pins together on top plane E4 SW1 DCDC converter 1 switching node - make a short connection to the coil LDCDC1 and connect all SW1 pins together on top plane E5 LED_OUT Flash LED current source output and connect all LED_OUT pins together on top plane 1. Application Information: The pin STROBE is usually connected directly to the camera processor. 2. When SCL and SDA exchanged, the AS3630 uses a different I²C address and the functionality of SCL/SDA is also exchanged - see “I²C Address Selection” on page 43. 3. Only input: The AS3630 does not perform clock stretching. 8A Supercap Flash Driver AS3630 – 5 Stresses beyond those listed under “Absolute Maximum Ratings“ may cause permanent damage to the device. These are stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated under “Operating Conditions” is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Absolute Maximum Ratings Figure AS3630 – 5: Absolute Maximum Ratings Parameter Min Max Units VIN, SDA, SCL, ON, STROBE, TXMASK/TORCH, INT, IND_OUT, NTC and BAL to GND -0.3 +7.0 V SDA, SCL, ON, STROBE, TXMASK/TORCH, INT, IND_OUT, NTC to GND -0.3 VIN + 0.3 V VDCDC, SW1, SW2, VDCDC, LED_OUT and VSUPERCAP to GND -0.3 +11 V VDCDC to SW1 VDCDC to SW2 VDCDC to LED_OUT VSUPERCAP to BAL -0.3 AGND, PGND to GND 0.0 -100 Input Pin Current without causing latchup Comments V Diode between • VDCDC and SW1 • VDCDC and SW2 • VDCDC and LED_OUT • VSUPERCAP and BAL 0.0 V Connect AGND and PGND to GND directly below the ball (short connection required) +100 +IIN mA Norm: EIA/JESD78 Continuous Power Dissipation (TA = +70ºC) Continuous power dissipation Continuous power dissipation derating factor 2770 mW 37 mW/ºC PT1 PDERATE2 Electrostatic Discharge ESD HBM ±2000 V Norm: JEDEC JESD22-A114F ESD MM ±100 V Norm: JEDEC JESD 22-A115-B AS3630 – 6 8A Supercap Flash Driver Parameter Min Max Units Comments Temperature Ranges and Storage Conditions Junction Temperature Storage Temperature Range Humidity Body Temperature during Soldering Moisture Sensitivity Level (MSL) +150ºC internally limited only during flash (max. 20000s) +125 ºC -55 +125 ºC 5 85 % Non condensing +260 ºC According to IPC/JEDEC J-STD-020 MSL 1 Represents a max. floor life time of unlimited 1. Depending on actual PCB layout and PCB used. 2. PDERATE derating factor changes the total continuous power dissipation (PT) if the ambient temperature is not 70ºC. Therefore for e.g. TAMB=85ºC calculate PT at 85ºC = PT - PDERATE * (85ºC - 70ºC) 8A Supercap Flash Driver AS3630 – 7 Electrical Characteristics All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality Control) methods. V VIN = +2.5V to +4.8V, TAMB = -30ºC to +85ºC, unless otherwise specified. Typical values are at V BAT = +3.7V, TAMB = +25ºC, unless otherwise specified. Figure AS3630 – 6: Electrical Characteristics Symbol Parameter Conditions Min Typ Max Units 2.5 3.7 4.8 V General Operating Conditions VVIN Supply Voltage ISHUTDOWN Shutdown Current AS3630 off, VBAT20.58mA 10 (3000mA range) >23.53mA 11 (4000mA range) Disabled If the voltage on LED_OUT stays below V LEDSHORT, a shorted LED is detected. 8A Supercap Flash Driver AS3630 – 35 If the voltage on VDCDC reaches V VOUTMAX and the voltage across the current source between VDCDC and LED_OUT is below V FLASH_COMP an open LED is detected. If an open or shorted LED is detected, bit fault_led is set. The DCDCs and current sinks are disabled and the Supercap is discharged by setting mode_setting=001b. In external torch mode, the register txmask_torch_mode is reset. Note: Short/open LED detection is disabled in PWM operating mode (mode_setting=101b). The voltage on VDCDC will nevertheless never exceed V VOUTMAX. AS3630 DIE Overtemperature Detected - fault_overtemp The junction temperature of the AS3630 is continuously monitored. If the temperature exceeds TOVTEMP, the DCDCs are stopped, the current sources are disabled (instantaneous) and the bit fault_overtemp is set (but the operating mode mode_setting is not changed). The driver is automatically re-enabled once the junction temperature drops below TOVTEMP-TOVTEMPHYST. Note: If an overtemperature is detected in Supercap pre-charge, transition or charge mode, charging is temporarily disabled until the temperature drops, but the register bit fault_overtemp is not set. Timeout Fault - fault_timeout If the flash is started a timeout timer is started in parallel. If the flash duration defined by the STROBE input (strobe_on=1 and strobe_type=1, see Figure 31) exceeds tFLASHTIMEOUT (adjustable by register flash_timeout), the DCDCs are stopped and the flash current source (on pin LED_OUT) is disabled (ramping down) and fault_timeout is set. If the flash duration is defined by the timeout timer itself (strobe_on = 0, see Figure 28), the register fault_timeout is not set after the flash has been finished. AS3630 will automatically select the operating mode according to register mode_after_flash shown in Figure 26. Supercap Short Detected - fault_sc_short In all operating modes except shutdown (mode_setting not 000b or 001b) once VSUPERCAP is above 2.4V both internal capacitors of the Supercap (VSUPERCAP-BAL and BAL-GND) are monitored if they are shorted. If any of them is shorted10, charging is stopped and the Supercap is discharged by setting mode_setting=001b andfault_sc_short is set. 10. VSUPERCAP-BAL is compared with typ. 950mV, BAL-GND is compared with typ. 700mV. AS3630 – 36 8A Supercap Flash Driver NTC - Flash LED Overtemperature Protection - fault_ntc Figure AS3630 – 34: NTC Internal circuit 
            

        
         

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  # The NTC input can be used to monitor the flash LED temperature if ntc_on=1. A internal current source controlled by NTC_current sources a current on pin NTC - see Figure 34. If the voltage on pin NTC drops below VNTC_TH, fault_ntc is set, the DCDCs are stopped and the flash current source (on pin LED_OUT) is disabled (instantaneous) by setting mode_setting depending on register mode_after_flash. If mode_after_flash=001b then mode_setting=001b (shutdown and discharge Supercap). All other settings of mode_after_flash result in mode_setting=000b (shutdown). As the external NTC cannot measure the LED temperature in real time during a short high current flash pulse (the duration from heating up of the LED until the NTC recognizes a too hot LED is usually too long), it is advisable to measure the LED temperature before the flash pulse (with the ADC and NTC_current) and judge how much current can be driven through the LED (to be estimated depending on LED heat sink and is usually specified by the LED manufacturer). LED Current Reduction Triggered - fault_current_reduced If during flash the LED current has been reduced (for conditions when this can occur see DCDC1 / DCDC2 Operating Principle During Flash operating mode 3.), the register bit fault_current_reduced is set for indication and lled_current_min is set to the reduced LED current. The operating mode is not changed and the DCDCs and current source continue operation. 8A Supercap Flash Driver AS3630 – 37 Supply Undervoltage Protection If the voltage on the pin VIN (=battery voltage) is or falls below V UVLO, the AS3630 is kept in shutdown state and all registers are set to their default state. Interrupt Output INT is an open drain, active low output. The internal circuit to control this pin is shown in Figure 35. Figure AS3630 – 35: Interrupts Processing
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 Once an interrupt event occurs (e.g. end of charge of Supercap; detailed description of interrupt events in “AS3630 Torch Operation with Duration Synchronized to STROBE Input ” on page 35, the interrupt flip flop is set (register status_eoc=1). If the interrupt mask is high (register status_eoc_mask=1), the output INT is pulled to low signalizing an interrupt condition. All 8 interrupt flip flops are automatically cleared upon readout of register Fault / Status. ADC The ADC is programmed by setting the ADC channel in register ADC_channel (page 52) and the ADC conversion is performed after setting ADC_convert (page 52). The actual timing when the ADC conversion is started / finished is programmed with ADC_convert as shown in Figure 36: AS3630 – 38 8A Supercap Flash Driver Figure AS3630 – 36: ADC Timings  
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   Once the conversion is finished ADC_convert returns to 00b, status_adc_eoc is set, and the result data is available from register 4 * ADC_D9-D2 + ADC_D1-D0. Note: The ADC input ranges and gains are described in Figure 6 subsection ADC. I²C Mode Serial Data Bus The AS3630 supports the I²C bus protocol. A device that sends data onto the bus is defined as a transmitter and a device receiving data as a receiver. The device that controls the message is called a master. The devices that are controlled by the master are referred to as slaves. A master device that generates the serial clock (SCL), controls the bus access, and generates the START and STOP conditions must control the bus. The AS3630 operates as a slave on the I²C bus. Within the bus specifications a standard mode (100kHz maximum clock rate) and a fast mode (400kHz maximum clock rate) are defined. The AS3630 works in both modes. Connections to the bus are made through the open-drain I/O lines SDA and SCL. The following bus protocol has been defined (Figure 37): • Data transfer may be initiated only when the bus is not busy. • During data transfer, the data line must remain stable whenever the clock line is HIGH. Changes in the data line while the clock line is HIGH are interpreted as control signals. Accordingly, the following bus conditions have been defined: Bus Not Busy Both data and clock lines remain HIGH. 8A Supercap Flash Driver AS3630 – 39 Start Data Transfer A change in the state of the data line, from HIGH to LOW, while the clock is HIGH, defines a START condition. Stop Data Transfer A change in the state of the data line, from LOW to HIGH, while the clock line is HIGH, defines the STOP condition. Data Valid The state of the data line represents valid data when, after a START condition, the data line is stable for the duration of the HIGH period of the clock signal. The data on the line must be changed during the LOW period of the clock signal. There is one clock pulse per bit of data. Each data transfer is initiated with a START condition and terminated with a STOP condition. The number of data bytes transferred between START and STOP conditions are not limited, and are determined by the master device. The information is transferred byte-wise and each receiver acknowledges with a ninth bit. Acknowledge Each receiving device, when addressed, is obliged to generate an acknowledge after the reception of each byte. The master device must generate an extra clock pulse that is associated with this acknowledge bit. A device that acknowledges must pull down the SDA line during the acknowledge clock pulse in such a way that the SDA line is stable LOW during the HIGH period of the acknowledge-related clock pulse. Of course, setup and hold times must be taken into account. A master must signal an end of data to the slave by not generating an acknowledge bit on the last byte that has been clocked out of the slave. In this case, the slave must leave the data line HIGH to enable the master to generate the STOP condition. AS3630 – 40 8A Supercap Flash Driver Figure AS3630 – 37: Data Transfer on I²C Serial Bus SDA MSB 7 bit SLAVE ADDRESS R/W DIRECTION ACKNOWLEDGEMENT SIGNAL FROM RECEIVER ACKNOWLEDGEMENT SIGNAL FROM RECEIVER SCLK 1 2 6 7 8 9 1 2 3-7 8 9 ACK START CONDITION REPEATED IF MORE BYTES ARE TRANS- STOP CONDITION OR REPEATED START CONDI- Depending upon the state of the R/W bit, two types of data transfer are possible: 1. Data transfer from a master transmitter to a slave receiver. The first byte transmitted by the master is the slave address. Next follows a number of data bytes. The slave returns an acknowledge bit after each received byte. Data is transferred with the most significant bit (MSB) first. 2. Data transfer from a slave transmitter to a master receiver. The master transmits the first byte (the slave address). The slave then returns an acknowledge bit, followed by the slave transmitting a number of data bytes. The master returns an acknowledge bit after all received bytes other than the last byte. At the end of the last received byte, a “not acknowledge” is returned. The master device generates all of the serial clock pulses and the START and STOP conditions. A transfer is ended with a STOP condition or with a repeated START condition. Since a repeated START condition is also the beginning of the next serial transfer, the bus is not released. Data is transferred with the most significant bit (MSB) first. The AS3630 can operate in the following two modes: 1. Slave Receiver Mode (Write Mode): Serial data and clock are received through SDA and SCLK. After each byte is received an acknowledge bit is transmitted. START and STOP conditions are recognized as the beginning and end of a serial transfer. Address recognition is performed by hardware after reception of the slave address and direction bit (see Figure 38). The slave address byte is the first byte received after the master generates the START condition. The slave address byte contains the 7-bit AS3630 address, which is shown in Figure 42, followed by the direction bit (R/W), which, for a write, is 0. 11 After receiving and decoding the slave address byte the device outputs an acknowledge on the SDA line. After the AS3630 8A Supercap Flash Driver AS3630 – 41 acknowledges the slave address + write bit, the master transmits a register address to the AS3630. This sets the register pointer on the AS3630. The master may then transmit zero or more bytes of data, with the AS3630 acknowledging each byte received. The address pointer will increment after each data byte is transferred. The master generates a STOP condition to terminate the data write. 2. Slave Transmitter Mode (Read Mode): The first byte is received and handled as in the slave receiver mode. However, in this mode, the direction bit indicates that the transfer direction is reversed. Serial data is transmitted on SDA by the AS3630 while the serial clock is input on SCLK. START and STOP conditions are recognized as the beginning and end of a serial transfer (Figure 39 and Figure 40). The slave address byte is the first byte received after the master generates a START condition. The slave address byte contains the 7-bit AS3630 address, which is shown in Figure 42, followed by the direction bit (R/W), which, for a read, is 1.12 After receiving and decoding the slave address byte the device outputs an acknowledge on the SDA line. The AS3630 then begins to transmit data starting with the register address pointed to by the register pointer. If the register pointer is not written to before the initiation of a read mode the first address that is read is the last one stored in the register pointer. The AS3630 must receive a “not acknowledge” to end a read. S Figure 42 Figure AS3630 – 38: Data Write - Slave Receiver Mode 0 A XXXXXXXX XXXXXXXX A S - Start A - Acknowledge (ACK) P - Stop A XXXXXXXX A XXXXXXXX A P Data Transferred (X + 1 Bytes + Acknowledge) 11. The address for writing to the AS3630 is shown in Figure 42 12. The address for read mode from the AS3630 is shown in Figure 42 AS3630 – 42 8A Supercap Flash Driver  S Figure AS3630 – 39: Data Read (from Current Pointer Location) - Slave Transmitter Mode Figure 42 1 A XXXXXXXX A XXXXXXXX A S - Start A - Acknowledge (ACK) P - Stop NA - Not Acknowledge (NACK) XXXXXXXX A XXXXXXXX NA P Data Transferred (X + 1 Bytes + Acknowledge) Note: Last data byte is followed by a NACK S Figure 42 0 A XXXXXXXX A XXXXXXXX S - Start Sr - Repeated Start A - Acknowledge (ACK) P - Stop NA - Not Acknowledge (NACK) A Sr Figure 42 A XXXXXXXX 1 A XXXXXXXX Figure AS3630 – 40: Data Read (Write Pointer, Then Read) - Slave Receive and Transmit A XXXXXXXX NA P Data Transferred (X + 1 Bytes + Acknowledge) Note: Last data byte is followed by a NACK I²C Address Selection Note: It is required to read the register Fixed ID twice after startup in order for the I²C address selection to identify the I²C address used. The AS3630 features two I²C slave addresses without having a dedicated address selection pin. The selection of the I²C address is done with the interconnection of AS3630 to the bus lines shown in the figure below. The serial interface logic inside AS3630 is able to distinguish between a direct I²C connection to the master or a second option where data and clock line are crossed. Therefore it is possible to address a maximum of two AS3630 slaves on one I²C bus. 8A Supercap Flash Driver AS3630 – 43 Figure AS3630 – 41: I²C Address Selection Application Diagram   

 
      
  

    

  The I²C address use is defined according to the figure below: Figure AS3630 – 42: I²C Addresses for AS3630 7 bit I²C address 8 bit I²C read address 8 bit I²C write address 1 (default; SCLK and SDA directly connected) 30h 60h 61h 2 (SCLK and SDA exchanged) 31h 62h 63h Device Number Figure 41 on page 44 8A Supercap Flash Driver AS3630 – 44 Register Description Figure AS3630 – 43: Register Overview Addr 00h Name Fixed ID fixed_id Access RO Reset Value 17h - fixed id (e.g. to check I²C communication) Note: It is required to read the register Fixed ID twice after startup in order for the I²C address selection to identify the I²C address used. Version reserved version Access RO RO Reset Value NA X Don't use by application Don't use by application 01h 8A Supercap Flash Driver AS3630 – 45 Addr Name Current Set LED led_current Access RW Reset Value 15h (206mA) LED Current pin LED_OUT; the range of this setting is defined by led_current_range LSB is 9.8mA (2500mA/255) for led_current_range=00b LSB is 980μA (250mA/255) for led_current_range=01b LSB is 11.76mA (3000mA/255) for led_current_range=10b led_current_range 02h AS3630 – 46 led_current 00b 01b 10b 11b 00h 0mA 0mA 0mA 0mA 01h 9.8mA 02h 19.6mA 03h 29.4mA Don’t use below 10mA (code 0Bh) Don’t use below 2506mA (code D5h) Don’t use below 2996mA (code BFh) ... ... D5h 2088mA 209mA 2506mA 3341mA ... ... ... ... ... FFh 2500mA 250mA 3000mA 4000mA 8A Supercap Flash Driver Addr Name Boost/TXMask Current led_current_range curr_limit_curr_r ed coil1_txmask_curr_red txmask_torch_mode Access RW RW RW RW Reset Value 00b 0b 011b 00b Reduce LDCDC1 current in steps of coil1_peak currents during TXMask (this is a delta value; e.g. -1 means one current step reduction e.g. from 2.5A to 2.0A; -4 means four steps e.g. from 2.5A to 750mA. if the reduction would result in a negative value, DCDC1 is switch off during TXMask event) 000 … -1 001 … -2 010 … -3 011 … -4 - default value 100 … -5 101 … -6 Function of TXMASK/TORCH pin 00 … no effect (default) 01 … txmask operation mode (applies for flash mode, mode_setting=111b) 10 … external torch mode (applies for shutdown mode, mode_setting=000b or 001b, max. led_current ≤ 460mA) 11 … don't use 03h Comment Range setting for led_current 00...10-2500mA range 01...10-250mA range 10...2500-3000mA range 11...don’t use use range “10” only for currents above 2500mA 110 … -7 111 … -8 If set, reduce LED current if LDCDC1 and LDCDC2 currents are hit and current source ILED cannot drive the output current. Note: In flash mode LDCDC1 is usually operated in current limit. 8A Supercap Flash Driver AS3630 – 47 Addr Name Coil and Charge Current charge_current coil2_peak coil1_peak Access RW RW RW Reset Value 01b 010b 100b Defines charging current of Supercap for pre-charge and ‘transition’ (to charge); afterwards coil1_peak defines current 04h Comment 00 … 200mA - low quiescent current mode 01 … 500mA 10 ... 750mA 11 … 1000mA AS3630 – 48 LDCDC2 Coil Peak current limit 000 … don’t use 001 … don’t use 010 … 2.43A (default) 011 … 3.14A 100 … 3.86A 101 … 4.57A 110 … 5.29 A 111 … 6.0A LDCDC1 Coil Peak current limit 000 … don’t use 001 … 750mA 010 … 1A 011 … 1.5A 100 … 2A (default) 101 … 2.5A 110 … 3A 111 … 3.5A 8A Supercap Flash Driver Addr Name Charge / Low Voltage bal_force_on end_of_charge_voltage vin_low_v Access RW RW RW Reset Value 0b 5h 5h Define Supercap end of charge Note: In pre-charge the Supercap is always charged close to VVIN; therefore end_of_charge_voltage ≥ VVIN 05h 0h … 4.61V 1h … 4.7V 2h … 4.79V 3h … 4.88V 4h … 4.97V 5h … 5.06V (default) 6h … 5.15V 7h … 5.24V 8h … 5.33V 9h … 5.42V Ah … 5.51V Bh … 5.61V Ch … 5.7V Dh … 5.79V Eh … 5.88V Fh … 5.97V Reduce coil1_peak current if the VIN voltage falls below vin_low_v 0h function is disabled 1h 3.0V 2h 3.07V 3h 3.14V 4h 3.22V 5h 3.3V - default 6h 3.38V 7h 3.47V 0 … balancing circuit is enabled according to the operating mode 1 … balancing circuit is always enabled 8A Supercap Flash Driver AS3630 – 49 Addr Name Flash Timer Access Reset Value ind_rampup_s mooth ind_rampdo wn_smooth flash_timeout RW RW RW 1 1 0Fh Flash timeout timer - define maximum flash time 4ms steps from 0…15h; 16ms steps from 16h to 63h 06h Smooth rampup during indicator blinking if ind_on=1 0... none 1...smooth (380ms) AS3630 – 50 Smooth rampdown during indicator blinking if ind_on=1 0... none 1...smooth (380ms) 00h … 4ms 01h … 8ms 02h … 12ms 03h … 16ms 04h … 20ms 05h … 24ms 06h … 28ms 07h … 32ms 08h … 36ms 09h … 40ms 0Ah … 44ms 0Bh … 48ms 0Ch … 52ms 0Dh … 56ms 0Eh … 60ms 0Fh … 64ms 10h … 68ms 11h … 72ms 12h … 76ms 13h … 80ms 14h … 84ms 15h … 88ms 16h … 104ms 17h … 120ms 18h … 136ms 19h … 152ms 1Ah … 168ms 1Bh … 184ms 1Ch … 200ms 1Dh … 216ms 1Eh … 232ms 1Fh … 248ms 20h … 264ms 21h … 280ms 22h … 296ms 23h … 312ms 24h … 328ms 25h … 344ms 26h … 360ms 27h … 376ms 28h … 392ms 29h … 408ms 2Ah … 424ms 2Bh … 440ms 2Ch … 456ms 2Dh … 472ms 2Eh … 488ms 2Fh … 504ms 30h … 520ms 31h … 536ms 32h … 552ms 33h … 568ms 34h … 584ms 35h … 600ms 36h … 616ms 37h … 632ms 38h … 648ms 39h … 664ms 3Ah … 680ms 3Bh … 696ms 3Ch … 712ms 3Dh … 728ms 3Eh … 744ms 3Fh … 760ms 8A Supercap Flash Driver Addr Name Control ind_on mode_after_flash keep_sc_ch arged ntc_on mode_setting Access RW RW RW RW RW Reset Value 0b 11b 0b 0b 001b Hardware NTC protection of LED_OUT 0…off 1…on 000 ... shutdown or external torch mode (leave Supercap charged) 001 ... shutdown or external torch mode and discharge Supercap with RDIS_CHARGE - default 010 ... pre charge Supercap (to VIN) 011 ... charge Supercap 100 ... torch operation (wo/ Supercap) - max. led_current ≤ 460mA 101 ... PWM Operation (main LED); max. led_current ≤ 303.9mA; led_current_range is set to 00b 110 ... torch operation sync to STROBE (STROBE=1: LED on; STROBE=0: LED off ) max. led_current ≤ 931mA 111 ... Flash Operation 07h 8A Supercap Flash Driver Iindicator current source on IND_OUT 0 … off 1… on, (current set by ind_current) Set the operating mode after flash (see Figure 23 on page 27): 00... shutdown (leave Supercap charged) 01... shutdown and discharge Supercap 10... pre charge Supercap (to VIN) 11... charge Supercap If set during PWM,Torch or Charge operation keep Supercap charged with 10mA current AS3630 – 51 Addr Name strobe_on strobe_type ADC_convert ADC_channel Access RW RW RW RW Reset Value 1b 1b 00b 0h Strobe and ADC control 08h Enable STROBE input STROBE input is 0 … edge sensitive 1 … level sensitive Control ADC conversion register is automatically reset to 00 after the conversion is finished Select ADC channel for conversion 0h … VDCDC 1h … LED_OUT 2h ... Tjunc (DIE Junction temperature) 3h … VSUPERCAP 4h ... don’t use 5h ... BAL 6h … VIN 7h ... NTC 8h … IND_OUT 9h ... don’t use Ah ... PGND. Bh ... don’t use Ch ... STROBE Dh ... INT Eh ... ON Fh ... don’t use 00 … ADC shutdown (no conversion performed or end of conversion) 01 … start ADC conversion immediately 10 … do ADC conversion 1.5ms after current rampup (beginning of flash) 11 … do ADC conversion just before current rampdown (at end of flash; flash duration is extended by 100μs) AS3630 – 52 8A Supercap Flash Driver Addr Name Fault / Status Access Reset Value status_eoc status_adc_e oc fault_led fault_overte mp fault_timeo ut fault_sc_short fault_ntc fault_current _reduced SS_RC1 SS_RC SS_RC SS_RC SS_RC SS_RC SS_RC SS_RC 0b 0b 0b 0b 0b 0b 0b 0b Shorted or open LED (LED_OUT) detected (see page 35) Overtemper ature (Tjunction) triggered (see page 36) Timeout has triggered (see page 36) Detect a shorted Supercap (BAL-GND) or (VSUPERCAPBAL) during charging (see page 36) LED Overtemper ture detection hit (monitored by NTC) (see page 36) LED Current has been reduced and register 09h End Of Supercap Charge (see page 35) ADC end of conversion reached (see page 35) led_current_min reports min. led current during flash cycle (see page 37) status_eoc_mas k status_adc_e oc_mask fault_led_mask fault_overte mp_mask fault_timeo ut_mask fault_sc_short _mask fault_ntc_m ask fault_current _reduced_m ask Access RW RW RW RW RW RW RW RW Reset Value 0b 0b 0b 0b 0b 0b 0b 0b If set, overtemper ature (Tjunction) triggers INT If set timeout triggers INT If set fault_sc_short triggers INT If set fault_ntc triggers INT If set fault_current _reduced triggers INT Interrupt Mask 0Ah If set, end of Supercap charge triggers INT 8A Supercap Flash Driver If set ADC end of conversion triggers INT If set, a shorted or open LED (LED_OUT) triggers INT AS3630 – 53 Addr Name PWM and Indicator ind_blink_delay ind_current led_out_pwm Access RW RW RW Reset Value 01b 000b 000b Control indicator blinking function delay between blinks if ind_on=1 0Bh 00 ... continuously on (no blinking) 01 ... 512ms 10 ... 1024ms 11 ... 2048ms Minimum LED Current 0Ch IND_OUT current setting if ind_on=1 000 … 1mA 001 … 2mA 010 … 3mA 011 … 4mA 100 … 5mA 101 … 6mA 110 … 7mA 111 … 8mA PWM modulate LED_OUT current if mode_setting=PWM operation; automatically uses led_current_range=00 (10mA...2500mA) but limits current to 303.9mA (codes 00h...1Fh for led_current) 000 1/32 PWM at 15.625kHz- subharmonic oscillation are possible - not recommended to use 001 don’t use - use 1/16 instead 010 3/32 PWM at 15.625kHz 011 don’t use - use 2/16 instead 100 1/16 PWM at 31.25kHz 101 2/16 PWM at 31.25kHz 110 3/16 PWM at 31.25kHz 111 4/16 PWM at 31.25kHz led_current_min Access RO Reset Value 00h At the beginning of a flash pulse, led_current_min is set to led_current then it is reduced upon following condition: (coil1_peak hit and coil2_peak hit and curr_limit_curr_red=1); led_current_min has the same coding used as led_current (the current reduction happens in steps as the coding of led_current is done) AS3630 – 54 8A Supercap Flash Driver Addr Name ADC MSB ADC_D9-D2 Access RO Reset Value NA 0Dh ADC MSB results bit 9 to bit 2 ADC LSB led_current_rampdown ADC_D1-D0 Access RW RO Reset Value 00 NA Automatically ramp-down of LED current register led_current during flash 00 ... no ramp-down 01 ...1LSB every 100μs 10 ...1LSB every 200μs 11 ...1LSB every 500μs ADC LSB results bit 1 to bit 0 0Eh 8A Supercap Flash Driver AS3630 – 55 Addr Name NTC test6 skip_enable ind_blink_on_time NTC_current Access R/W RW RW RW 0 1 10 8h Reset Value 0Fh Test bit - don’t use Allow pulse-skip operation or force 4MHz operation 0...4MHz operation 1...pulse-skip Control indicator blinking on-time if ind_on=1 (excluding rampup/down) 00 ... 0ms (immediate ramp-down after ramp-up) 01 ... 128ms 10 ... 256ms - default 11 ... 512ms Current through the NTC when overtemperature protection of the LEDs (LED_OUT) is monitored 0h … off; use for an external drive of NTC 1h … 40μA 2h … 80μA 3h … 120μA 4h … 160μA 5h … 200μA 6h … 240μA 7h … 280μA 8h … 320μA - default 9h … 360μA Ah … 400μA Bh … 440μA Ch … 480μA Dh … 520μA Eh … 560μA Fh … 600μA OTP1 OTP_data1 Access RO Reset Value NA 10h Data of OTP AS3630 – 56 8A Supercap Flash Driver Addr Name OTP2 OTP_data2 Access RO Reset Value NA 11h Data of OTP OTP3 OTP_data3 Access RO Reset Value NA 12h Data of OTP 13h OTP4 OTP_lock OTP_data4 Access RO RO Reset Value NA NA Data of OTP 0 ... OTP is program-able (unlocked) 1... OTP is locked and no further programming of OTP is possible 1. SS_RC = automatically cleared upon readout 8A Supercap Flash Driver AS3630 – 57 Register Map Figure AS3630 – 44: Register Map Addr Name Default 00h Fixed ID 17h 01h Version XXh 02h Current Set LED 15h 03h Boost/TXMas k Current 0Ch led_current_range 04h Coil and Charge Current 54h charge_current 05h Charge / Low Voltage 2Dh bal_force_on 06h Flash Timer CFh ind_rampup_s mooth 07h Control 61h ind_on 08h Strobe and ADC control C0h strobe_on strobe_type 09h Fault / Status1 00h status_eoc status_adc_ eoc AS3630 – 58 fixed_id reserved version led_current curr_limit_curr _red coil1_txmask_curr_red txmask_torch_mode coil2_peak coil1_peak end_of_charge_voltage ind_rampdo wn_smooth vin_low_v flash_timeout mode_after_flash keep_sc_ch arged ntc_on ADC_convert fault_led fault_overt emp mode_setting ADC_channel fault_timeo ut fault_sc_shor t fault_ntc fault_curren t_reduced 8A Supercap Flash Driver Addr Name Default 0Ah Interrupt Mask 00h status_eoc_m ask status_adc_ eoc_mask fault_led_mask fault_overt emp_mask fault_timeo ut_mask fault_sc_shor t_mask fault_ntc_ mask fault_curren t_reduced_ mask 0Bh PWM and Indicator 40h 0Ch Minimum LED Current NA led_current_min 0Dh ADC MSB NA ADC_D9-D2 0Eh ADC LSB 0Xh 0Fh NTC 68h 10h OTP1 NA OTP_data12 11h OTP2 NA OTP_data2 12h OTP3 NA OTP_data3 13h OTP4 NA ind_blink_delay led_current_rampdown test6 skip_enable OTP_lock Read-Only Register R/W Register ind_current 0 led_out_pwm 0 0 ind_blink_on_time 0 ADC_D1-D0 NTC_current OTP_data4 if writing to read-only register is required, write ‘0’ to read-only positions (e.g. ADC LSB) 1. The register Fault / Status is a read only register, which is automatically cleared after readout. Therefore only a single I²C access is required to poll the status of the AS3630. 2. If OTP data are fused in-circuit, expect a small yield loss. 8A Supercap Flash Driver AS3630 – 59 Application Information External Components Supercap The Supercap performance is critical for the performance of AS3630. As the Supercap is affected by aging, the flash performance has to be checked at end of life conditions. Figure AS3630 – 45: Recommended Supercap’s Part Number C ESR Rated Voltage Peak Rated1 Voltage Match ing2 Temp Range3 Size DME2Z5R5K43 4M3BT 430mF ±20% 50mΩ 5.5V 4.2V 3μF@4.5V X5R 6V3 0603 Manufacturer Murata www.murata.com Taiyo Yuden www.t-yuden.com If a different input capacitor is chosen, ensure similar ESR value and at least 3μF capacitance at the maximum input supply voltage. Larger capacitor values (C) may be used without limitations. Optionally add a smaller capacitor in parallel to the input pin VIN (e.g. Murata GRM155R61C104, >50nF @ 3V, 0402 size). 8A Supercap Flash Driver AS3630 – 61 Output Capacitor C DCDC1 , C DCDC2 Low ESR capacitors should be used to minimize VDCDC ripple and therefore current ripple on the LED. Multi-layer ceramic capacitors are recommended since they have extremely low ESR and are available in small footprints. The capacitor should be located as close to the device as is practical. X5R dielectric material is recommended due to their ability to maintain capacitance over wide voltage and temperature range. Figure AS3630 – 48: Recommended DCDCs Capacitor Part Number GRM219R61A106ME47 GRM219R61A106ME441 2 x C2012X5R1A106M2 C TC Code Related Voltage Size X5R 10V 0805 (2.0x1.25x0.85mm max 1mm height) 10V 2x0805 (2.0x1.25x0.85mm max 0.95mm height) 10μF ±20% >4.8μF@5V 10μF ±10% >4.05μF@5V 10μF ±20% X5R Manufacturer Murata www.murata.com TDK www.tdk.com 1. If TAMB4.2μF capacitance at 5V. If a different output capacitor is chosen, ensure similar ESR values and at least 4.2μF capacitance at 5V output voltage and for CDCDC1 10V voltage rating, C DCDC2 6.3V voltage rating. Inductor L DCDC1 LDCDC1 is used for charging of the Supercap, operate the LED in torch and PWM operation and in parallel to L DCDC2 to power the LED during flash. Due to the different durations of the operation modes, different peak current limits apply (see Figure 49). The fast switching frequency (4MHz) of the AS3649 allows for the use of small SMDs for the external inductor. The saturation current ISATURATION should be chosen to be above the maximum value of ILDCCD1 13. The inductor should have very low DC resistance (DCR) to reduce the I2R power losses - high DCR values will reduce efficiency. 13. Can be adjusted in I²C mode with register coil1_peak AS3630 – 62 8A Supercap Flash Driver Figure AS3630 – 49: Recommended Inductor Part Number L max. coil1_peak setting for DCR Other modes Size Flash 3.2x2.5x0.9mm max 1.0mm height LQM32PN1R0MG0 1.0μH >0.6μH @ 3.0A 60mΩ 2.0A 3.0A SPM3012T-1R0M 1.0μH ±20% 57mΩ ±10% 2.5A 3.0A (3.5A2) 3.2x3x1.2 mm height is max CIG32W1R0MNE 1.0μH >0.7μH @ 2.7A >0.6μH @ 3.0A 60mΩ ±25% 2.0A 3.0A 3.2x2.5mm max 1.0mm height CKP3225N1R0M 1.0μH >0.6μH @ 3.0A 0.6μH@ 2.75A Manufacturer 1 Murata www.murata.com TDK www.tdk.com Samsung Electro-Mechancs www.sem.samsun g.co.kr Taiyo Yuden www.t-yuden.com 45mΩ 2.5A 2.5A 2.5x2.0x1.2mm height is max 1. Flash pattern: 200ms/3A, 200ms pause, 200ms/3A, 2s then repeat again (no limit on the number of total cycles) Alternative pattern with 1000ms/1.6A, 200ms pause, 200ms/3A, 200ms pause, 200ms/3A, 2s then repeat again. (no limit on the number of total cycles) 2. Check with coil supplier 3. Check with coil supplier for worst case flash pattern. If a different inductor is chosen, ensure similar DCR values and at least0.6μH inductance at ILDCCD1 set by coil1_peak. Inductor L DCDC2 LDCDC2 is used in parallel to L DCDC1 to power the LED during flash. The whole current from the Supercap flows through LDCDC2 therefore a high power inductor is required. The fast switching frequency (4MHz) of the AS3649 allows for the use of small SMDs for the external inductor. The saturation current ISATURATION should be chosen to be above the maximum value of ILDCCD2 14. The inductor should have very low DC resistance (DCR) to reduce the I2R power losses - high DCR values will reduce efficiency 14. Can be adjusted in I²C mode with register coil2_peak 8A Supercap Flash Driver AS3630 – 63 Figure AS3630 – 50: Recommended Inductor Part Number L MPI4040R2-1R0-R 1.0μH >0.6μH @ 6.0A DCR 25mΩ max. coil2_peak setting Size 6.0A (max. value) 4.06x4.45x1 .5mm height is max 1 MPI4040R1-1R0-R 1.0μH >0.6μH @ 6.0A 40mΩ check with coiltronics 4.06x4.45x1 .2mm height is max XAL4020-102ME_ 1.0μH >0.6μH @ 6.0A 13.25mΩ 6.0A (max. value) 4x4x2mm max 2.1mm height XFL4020-102ME_ SPM4012T-1R0M 1.0μH >0.6μH @ 5.29A 1.0μH ± 20% 14.4mΩ 38mΩ 57mΩ ±10% 5.29A 4x4x2mm max 2.1mm height 4.57A 4.4x4.1x1.2 mm height is max 3.0A (3.5A2) 3.2x3x1.2 mm height is max SPM3012T-1R0M 1.0μH ± 20% LQM32PN1R0MG0 1.0μH >0.6μH @ 3.0A 60mΩ 3.0A3 3.2x2.5x0.9 mm max 1.0mm height CIG32W1R0MNE 1.0μH >0.7μH @ 2.7A >0.6μH @ 3.0A 60mΩ ±25% 3.0A 3.2x2.5mm max 1.0mm height CKP3225N1R0M 1.0μH >0.6μH @ 3.0A