® RT8966H Mini Analog Baseband Power Management IC General Description Features The RT8966H is an analog subsystem which includes a linear charger, 4 LDOs, a 4-CH current source, and a multiplexer for USB, UART, microphone, stereo and audio on a single mini/micro USB connector. Hi-Speed USB Operation Interrupt for Device Insertion and Removal Interrupt for SEND/END Button Detection Interrupt for Protection Function Low Power Microphone Standby Mode Default Startup Mode for Factory Support Negative Rail Audio Signal Paths Internal LDO for Low Noise Microphone Bias 28V Maximum Rating for DC Adapter Internal Integrated Power MOSFETs of Charger Support 4.35V/2.3A Factory Mode I2C Controlled Interface 4 Current Sources with 32-Steps Current Setting 4 LDOs with Programmable Output Voltage Thin 32-Lead WQFN Package RoHS Compliant and Halogen Free The RT8966H adopts an I2C bus for control and uses an internal method to determine the connected device. The USB input provides high speed USB connection. The audio inputs feature negative rail signal operation to realize simple DC coupled headset speakers. The RT8966H provides an internal device detection method by using the USB ID signal pin and the VBUS voltage. The resistor values and VBUS voltage determine the unique detection method of each accessory. The host microprocessor adopts I2C to control the switch position and read the results of the accessory detection. The RT8966H can also detect USB chargers, including dedicated chargers (D+/ D− shorted) and high, power, host/hub chargers. The RT8966H has a linear charger with maximum 1A current capability. The charging current and end of charge current can be controlled by I2C interface. It also provides a 50mA LDO to support the power of the peripheral circuit. In factory mode, the RT8966H provides 4.35V/2.3A power to support system operation. The RT8966H is available in a thin WQFN-32L 4x4 package. Ordering Information RT8966H Applications Cellular Phone Smart Handheld Device Marking Information 0Y= : Product Code YMDNN : Date Code 0Y=YM DNN Pin Configurations (TOP VIEW) DSS INT SCL SDA GND EXPDET VBAT VBAT Package Type QW : WQFN-32L 4x4 (W-Type) Lead Plating System G : Green (Halogen Free and Pb Free) Note : Richtek products are : RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. 1 24 2 23 3 22 4 5 6 21 GND 20 33 19 7 18 8 17 VBUS VBUS DD+ ID RES CAP MIC 9 10 11 12 13 14 15 16 LED3 LED4 DN DP U1 U2 AUD1 AUD2 32 31 30 29 28 27 26 25 OUT1 OUT2 VIN OUT3 OUT4 GND LED1 LED2 WQFN-32L 4x4 Copyright © 2015 Richtek Technology Corporation. All rights reserved. DS8966H-00 July 2015 is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT8966H Typical Application Circuit Typical Application Circuit with Battery Installed : RT8966H 25, 26 3 VIN VBAT 7 LED1 8 LED2 9 LED3 10 LED4 IOVCC R3 10k I C Data 1µF VBUS I C Clock 30 SCL USB 2.0 High Speed 11 DN 12 DP UART 13 U1 14 U2 Audio 15 AUD1 16 AUD2 Baseband 6, 28, 33 (Exposed Pad) VBUS CVBUS 22pF 1µF DD+ D+ 21 ID 20 ID R4 2.2k 19 RES 18 CAP OUT1 OUT2 17 23, 24 DSS 32 D- 22 29 SDA 2 PMIC EXPDET 27 31 INT 2 + MIC OUT3 OUT4 GND 22pF GND Micro USB Interface Interrupt Micro Controller R1 R2 10k 10k CVBAT 1µF CCAP 1µF 1 2 4 5 C4 1µF C1 1µF C2 1µF C3 1µF Typical Application Circuit for Factory Mode with no Battery Installed : Battery not Installed for PTM RT8966H 3 VIN 7 LED1 8 LED2 IOVCC Interrupt 2 I C Data 2 I C Clock R3 10k 31 INT CVBAT 1µF VBUS D- 22 D+ 21 ID 20 13 U1 14 U2 Audio 15 AUD1 16 AUD2 17 6, 28, 33 (Exposed Pad) RES CAP OUT1 OUT2 MIC GND PMIC 1µF 30 SCL UART > 40µF OUT3 OUT4 VBUS 23, 24 DSS 32 11 DN 12 DP + EXPDET 27 29 SDA USB 2.0 High Speed Baseband 25, 26 19 CVBUS 22pF 1µF 22µF DD+ ID R4 2.2k 22pF GND Micro USB Interface Micro Controller R1 R2 10k 10k 9 LED3 10 LED4 VBAT Bulk Capacitance needed for operation without battery 18 CCAP 1µF 1 2 4 5 C3 1µF C2 1µF C1 1µF C4 1µF Copyright © 2015 Richtek Technology Corporation. All rights reserved. www.richtek.com 2 is a registered trademark of Richtek Technology Corporation. DS8966H-00 July 2015 RT8966H Functional Pin Description Pin No. Pin Name Pin Function 1 OUT1 LDO1 Output Voltage. 2 OUT2 LDO2 Output Voltage. 3 VIN LDO Input Power Supply. 4 OUT3 LDO3 Output Voltage. 5 OUT4 LDO4 Output Voltage. 6, 28, 33 (Exposed Pad) GND Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. 7 LED1 LED1 Current Source Output. 8 LED2 LED2 Current Source Output. 9 LED3 LED3 Current Source Output. 10 LED4 LED4 Current Source Output. 11 DN USB lnout1 for D. 12 DP USB Input2 for D+. 13 U1 UART/USB Full Speed Input1. 14 U2 UART/USB Full Speed Input2. 15 AUD1 Stereo Audio Input1. (Negative rail capable). 16 AUD2 Stereo Audio Input2. (Negative rail capable). 17 MIC Microphone Input. 18 CAP Internal LDO Output. Connect a 1F ceramic (X5R, X7R or better) capacitor between CAP and GND. Do not use CAP to power other circuitry. 19 RES External Microphone Bias Resistor. Connect a resistor (typical 2.2k) between RES and UlD line. 20 ID USB lD Input. Connect to lD on mini/micro USB connector. 21 D+ Common Output2.Connect to D+ on min/micro USB connector. 22 D- Common Output1.connect to D- on mini/micro USB connector. 23, 24 VBUS USB VBUS Input. Provides power for internal circuitry in the case VBAT < VBUS and used to sense presence of voltage on USB VBUS. 25, 26 VBAT Power Supply Input. Connect to Li-ion battery or other voltage source. 27 EXPDET LDO Output (4.9V). This pin provides 50mA output current. 29 SDA l2C Serial Data Input/Output. Connect to an external pull up resistor. 30 SCL l2C Serial Clock Input. Connect to an external pull up resistor. 31 lNT Interrupt Output-Open Drain. Connect to an external pull up resistor. 32 DSS Multiple Use Pin. Used to set Default Startup mode based on dc voltage when power is applied. Copyright © 2015 Richtek Technology Corporation. All rights reserved. DS8966H-00 July 2015 is a registered trademark of Richtek Technology Corporation. www.richtek.com 3 RT8966H Function Block Diagram LED1 LED2 LED3 LED4 OUT1 OUT2 DAC LDO1 LDO2 OUT3 OUT4 LDO3 LDO4 VIN UPIC Charger Block VBAT VBUS VCCINT LDO LDO EXPDET DN U1 AUD1 DUSB Charger Detection DP U2 AUD2 D+ ID MIC ADC + - 1.8V + VUVP - VCCINT 100k SE-COMP + Control DSS 100k 800k RES + 300k MR-COMP GND 200k 620 100k 2.3V CAP SCL SDA INT Copyright © 2015 Richtek Technology Corporation. All rights reserved. www.richtek.com 4 is a registered trademark of Richtek Technology Corporation. DS8966H-00 July 2015 RT8966H Absolute Maximum Ratings (Note 1) VBUS ----------------------------------------------------------------------------------------------------------------All Other Inputs ----------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25°C WQFN-32L 4x4 ----------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 2) WQFN-32L 4x4, θJA -----------------------------------------------------------------------------------------------WQFN-32L 4x4, θJC ----------------------------------------------------------------------------------------------Junction Temperature ---------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) -----------------------------------------------------------------------Storage Temperature Range ------------------------------------------------------------------------------------ESD Susceptibility (Note 3) HBM (Human Body Model) --------------------------------------------------------------------------------------MM (Machine Model) ---------------------------------------------------------------------------------------------- Recommended Operating Conditions −0.3V to 28V −0.3V to (VIN + 0.3V) 3.59W 27.8°C/W 7°C/W 150°C 260°C −65°C to 150°C 2kV 200V (Note 4) Battery Supply Voltage Range, VBAT ------------------------------------------------------------------------USB Supply Voltage Range, VBUS ---------------------------------------------------------------------------Junction Temperature Range ------------------------------------------------------------------------------------Ambient Temperature Range ------------------------------------------------------------------------------------- 2.8V to 5.5V 4.3V to 6.7V −40°C to 125°C −40°C to 85°C Electrical Characteristics (VBAT = 3.7V, TA = 25°C, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit 6.7 6.9 7.1 V 3.5 3.7 3.9 V DC Characteristics VBUS OVP Threshold VOVP Voltage VBUS UVP Threshold VUVP Voltage OTP (Note 5) -- 135 -- °C OTP Hysteresis (Note 5) -- 10 -- °C VSWPOS (Note 5) -- 3.4 -- VSWNEG (Note 5) -- 1.9 -- 2.1 2.5 2.8 2.5 2.6 2.7 2.2 2.3 2.4 Internal Switch Supplies V VBAT UVLO VUVLO_BAT ID LDO Voltage VLDO VBAT = 3.5V ID LDO PSRR PSRRLDO VLDO = 1, VBAT = 3.3 0.2V, f = 217Hz, IID = 100A (Note 5) -- 90 -- dB ID LDO Noise NLDO ID_2P2 = 1, MICLP = 0, f = 400Hz to 4kHz, ILOAD = 100A (Note 5) -- 5 -- VRMS VBAT Supply PSRR PSRRVBAT Noise from VBAT to D-, D+, or ID, RL = 50; f = 10kHz, VBAT = 3.5 0.2V (Note 5) -- 80 -- dB I2C bit : VLDO = 0 2 I C bit : VLDO = 1 V V Copyright © 2015 Richtek Technology Corporation. All rights reserved. DS8966H-00 July 2015 is a registered trademark of Richtek Technology Corporation. www.richtek.com 5 RT8966H Parameter Min Typ Max Unit IVBAT_L VBAT = 4.5V, VBUS = 0V, CP_EN = 0, ADCEN = 0, SEMREN = 0; ID_200 = 0, ID_620 = 0, ID_2P2 = 0, CHG_OFF = 1, CHG_EN = 0, SCL = 0, SDA = 0 -- 10 15 A IVBAT_S VBAT = 4.5V, VBUS = 0V, VID = 0V, CP_EN = 1 and either ADCEN = 1 or SEMREN = 1, ID_620 = 0, ID_2P2 = 0, ID_200 = 0, CHG_OFF = 1, CHG_EN = 0 -- 44 -- A VBUS Supply Current IVBUS VBUS = 5V, VBAT = 4.5V, VID = 0V, CP_EN = 1, either ADCEN = 1 or SEMREN = 1, ID_2P2 = 0, ID_620 = 0 CHG_OFF = 1, CHG_EN = 0, ID_200 = 0 -- 168 211 A D- Pull up Resistor RD-DET VD- = 0V 63 106 332 k D- Comparator Threshold Default Startup Switch Position Comparator Threshold Default Startup Switch Position Pull down Resistor Microphone Removal Threshold SEND/END Threshold VD-DET 0.86 1.8 2.83 V VBAT Leakage Current VBAT Supply Current Symbol Test Conditions VDSP Measured at IC -- 1 -- V RDSP Measured at IC 130 273 660 k VMRCOMP In Percent of LDO voltage 85 -- 95 % VSECOMP In Percent of LDO voltage 5 -- 15 % VDAT_SRC Voltage VDAT_SRC With IDAT_SRC = 0 to 200A 0.5 -- 0.7 V VDAT_REF Voltage VDAT_REF 0.25 -- 0.4 V VLGC Voltage VLGC 0.8 -- 2 V IDATA_SINK Current IDAT_SINK 50 -- 150 A IDPU1 Resistance RIDPU1 -- 200 -- k IDPU2 Resistance RIDPU2 -- 620 -- RCD Resistance RCD k ADC Detection Resistors RADC May be a resistance if desired 200 -- 600 GND -- -- 5 R1 -- 24 -- R2 -- 56 -- R3 -- 100 -- R4 -- 130 -- R5 -- 180 -- R6 -- 240 -- R7 -- 330 -- R8 -- 430 -- R9 -- 620 -- R10 -- 910 -- 1600 -- -- Open k Copyright © 2015 Richtek Technology Corporation. All rights reserved. www.richtek.com 6 is a registered trademark of Richtek Technology Corporation. DS8966H-00 July 2015 RT8966H Parameter Symbol Test Conditions Min Typ Max Unit 0 VSWNEG --- VCCINT VSWPOS V -- 3 -- USB Analog Switch (DN1, DP2) Analog Signal Range VDN1, VDP2 On-Resistance RDS(ON)_USB CP_EN = 0 CP_EN = 1 VBAT = 3V, CP_EN = 1, ICOMx = 10mA, VCOMx = 0V to 3V On-Resistance Match RDS(ON)_USB Between Channels VBAT = 3V, CP_EN = 1, ICOMx = 10mA, VCOMx = 400mV -- 0.5 -- Off Leakage Current IUSB_Off VBAT = 4.35V, Switch open, VDN1 or VDP2 = 0.3V, 2.5V, VCOMx = 2.5V, 0.3V 360 -- 360 nA On Leakage Current IUSB_On VBAT = 4.35V, Switch closed, VDN1 or VDP2 = 0.3V, 2.5V 360 -- 360 nA CP_EN = 0 0 -- VCCINT CP_EN = 1 VSWNEG -- VSWPOS VBAT = 3V, CP_EN = 1, ICOMx = 10mA, VCOMx = 0V to 3V -- 12 -- On-Resistance Match = 3V, CP_EN = 1, ICOMx = 10mA, V RDS(ON)_UART BAT Between Channels VCOMx = 1.5V -- 5 -- UART/USB Analog Switch (U1, U2) Analog Signal Range VU1, VU2 On-Resistance RDS(ON)_UART V Off Leakage Current IUART_Off VBAT = 4.35V, Switch open, VU1 or VU2 = 0.3V, 2.5V, VCOMx = 2.5V, 0.3V 360 -- 360 nA On Leakage Current IUART_On VBAT = 4.35V, Switch closed, VU1 or VU2 = 0.3V, 2.5V 360 -- 360 nA MIC Analog Switch (MIC) Analog Signal Range VMIC CP_EN = 0 0 VCCINT CP_EN = 1 VSWNEG VSWPOS V On-Resistance RDS(ON)_M VBAT = 3V, CP_EN = 1, IMIC = 10mA, VMIC = 0V to 3V -- 3.4 10 On-Resistance Flatness RFLATM VBAT = 3V, CP_EN = 1, IMIC = 10mA, VMIC = 0V to 3V (Note 5) -- 0.1 -- Off Leakage Current ILM_Off VBAT = 4.35V, Switch open, VMIC = 0.3V, 2.5V, VID = 2.5V, 0.3V 360 -- 360 nA On Leakage Current ILM_On VBAT = 4.35V, Switch closed, VMIC = 0.3V, 2.5V 360 -- 360 nA CP_EN = 0 0 -- VCCINT CP_EN = 1 VSWNEG -- VSWPOS -- 4 -- -- 0.2 -- -- 1 -- Audio Analog Switch (AUD1, AUD2) Analog Signal Range VAUDIO On-Resistance Match RDS(ON)_A Between Channels VBAT = 3V, CP_EN = 1, ICOMx = 10mA, VCOMx = 2V to 3V VBAT = 3V, CP_EN = 1, ICOMx = 10mA, VCOMx = 0V On-Resistance Flatness VBAT = 3V, CP_EN = 1, ICOMx = 10mA, VCOMx = 0.5 to 0.5V (Note 5) On-Resistance RDS(ON)_A RFLATA V Copyright © 2015 Richtek Technology Corporation. All rights reserved. DS8966H-00 July 2015 is a registered trademark of Richtek Technology Corporation. www.richtek.com 7 RT8966H Parameter Symbol Off Leakage Current ILA_(OFF) On Leakage Current ILA_(ON) Shunt Resistor RSHUNT Test Conditions VBAT = 4.35V, Switch Open, VAUDx = 0.5V to 0.5V, VCOMx = 0.5V to 0.5V VBAT = 4.35V, Switch Closed, VAUDx = 0.5V, 2V Min Typ Max Unit 360 -- 360 nA 360 -- 360 nA 30 100 200 1.4 -- -- -- -- 0.4 1 -- 1 A -- -- 0.4 V -- -- 400 kHz Digital Signals (DSS, SCL, SDA) DSS, SCL, Logic-High VIH SDA Input Voltage Logic-Low VIL Threshold Input Leakage Current IINLEAK Open Drain Low VODOL V ISINK = 1mA DYNAMIC 2 I C Max Clock MIC_LP Detection Pulse Time fI2CCLK tMICLPDP MIC_LP = 1, SEMREN = 1 -- 120 -- s MIC_LP Detection Period tMICLPD MIC_LP = 1, SEMREN = 1 -- 120 -- ms CP_EN Delay Time tCP_EN Not production tested -- -- 1 ms tON I C Stop to Switch On; RL = 50 -- -- 1 ms tOff I C Stop to Switch Off; RL = 50 -- -- 1 ms tD RL = 50 >0 -- -- s Analog Switch Turn On Time Analog Switch Turn Off Time Break-Before-Make Delay Time 2 2 (Note 5) Charger Debounce Time tCHGR_DET_DBNC 20 -- 40 ms VDAT_SRC ON Time tDP_SRC_ON 100 -- 200 ms VDAT_SRC OFF To ISET enable tDPSRC_HICHRNT 40 -- 80 ms Debounce Time tMDEB All Comparators 20 -- 500 ms DN1, DP2 RL = 50, f = 20kHz, U1, U2 VCOMx = 0.5Vp-p AUD1, AUD2 (Note 5) MIC RL = 50, f = 20kHz, VCOMx = 1VRMS (Note 5) f = 20Hz to 20kHz, MIC VCOMx = 0.5Vp-p, RL = 50; DC Audio bias=0 (Note 5) ----- 60 60 60 60 ----- dB -- 115 -- dB -- 0.05 -- -- 0.05 -- VBUS-VBAT VOS Rising -- 75 150 mV VBUS-VBAT VOS Falling 18 32 -- mV 3.9 3.95 4 V Off-Isolation VISO Cross-talk VCT Total Harmonic Distortion THD % Battery Charger DPM Regulation Voltage VDPM Copyright © 2015 Richtek Technology Corporation. All rights reserved. www.richtek.com 8 is a registered trademark of Richtek Technology Corporation. DS8966H-00 July 2015 RT8966H Parameter Symbol Test Conditions Min Typ Max Unit 4.307 4.35 4.393 V -- 125 -- °C 2.5 2.6 2.7 V Pre-Charge Current Accuracy -- 10 -- mA Fast-Charge Current Accuracy -- 5 -- % Fast-Charge to Pre-Charge Deglitch Time -- 25 -- ms -- 250 500 mV -- 3 6 4.75 4.9 5.05 V 60 120 180 mA 4.263 4.35 4.437 V 2.3 -- -- A 3.2 3.3 3.4 V 300 -- -- mA VBAT Regulation Voltage TA = 0°C to 85°C Thermal Regulation (Note 5) Pre-Charge Threshold VPRECH VBUS Power FET RDS(ON) VBAT Rising IBAT = 1A LDO RDS(ON) LDO Output Voltage LDO Maximum Output Current CVBUS = 22F, CVBAT 40F Factory Mode VOUT Factory Mode Maximum Output Current Linear Regulator LDO Output Voltage Setting OUTx = 3.3V Output Current IOUT-LDO Drop Out Voltage IDROP-LDO VIN = OUTx 100mV / IOUTx = 100mA -- 0.13 -- V Supply Current IQ-LDO -- 20 -- A Power Supply Rejection Ratio PSRRLDO (Note 5) -- 70 -- dB LED Quiescent Current IQ-LED -- 100 -- A Maximum LED Current ILED(MAX) -- 30 -- mA LED Current Accuracy ILED -- 5 -- % -- 5 -- % VIN = 4.2V / IOUTx = 0mA LED Current Source Setting ILED = 20mA LED Current Match Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may affect device reliability. Note 2. θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is measured at the exposed pad of the package. Note 3. Devices are ESD sensitive. Handling precaution is recommended. Note 4. The device is not guaranteed to function outside its operating conditions. Note 5. Guaranteed by Design. Copyright © 2015 Richtek Technology Corporation. All rights reserved. DS8966H-00 July 2015 is a registered trademark of Richtek Technology Corporation. www.richtek.com 9 RT8966H Typical Operating Characteristics MIC RDS(ON) vs. Temperature DN1 and DP2 RDS(ON) vs. Temperature 2.0 7 1.8 6 1.4 (Ω) RDS(ON) (ohm) (Ω) RDS(ON) (ohm) 1.6 1.2 1.0 0.8 0.6 5 D1 4 D2 3 2 0.4 1 0.2 VBAT = 3.8V VBAT = 3.8V 0.0 0 -50 -25 0 25 50 75 100 125 -50 -25 Temperature (°C) 25 50 75 100 125 Temperature (°C) U1 and U2 RDS(ON) vs. Temperature AUD1 and AUD2 RDS(ON) vs. Temperature 18 10 16 9 8 14 U1 12 (Ω) RDS(ON) (ohm) (Ω) RDS(ON) (ohm) 0 U2 10 8 6 4 7 6 AUD1 5 AUD2 4 3 2 2 VBAT = 3.8V 0 1 VBAT = 3.8V 0 -50 -25 0 25 50 75 100 Temperature (°C) Copyright © 2015 Richtek Technology Corporation. All rights reserved. www.richtek.com 10 125 -50 -25 0 25 50 75 100 125 Temperature (°C) is a registered trademark of Richtek Technology Corporation. DS8966H-00 July 2015 RT8966H Application Information Charger Description Constant Voltage Mode : The RT8966H integrates a single-cell Li-ion battery charger IC with pre-charge mode, a fast charge mode (constant current mode) or constant voltage mode. The charge current is programmable via the I2C interface as shown in the control register address tables, CHG_Ctrl1 and CHG_Ctrl2. The CV mode voltage is fixed at 4.35V. The pre-charge threshold is fixed at 2.6V. If the battery voltage is below the pre-charge threshold, the RT8966H charges the battery with a trickle current until the battery voltage rises above the pre-charge threshold. The RT8966H is capable of being powered up from AC adapter and USB (Universal Serial Bus) port inputs. Moreover, the RT8966H includes a linear regulator (LDO 4.9V, 50mA) for supplying low power external circuitry. Once the battery voltage level closes in at 4.35V, the charger enters constant voltage phase and the charging current begins to decrease. When the charging current becomes lower than IEOC (end of charge current), the loop enters charge done mode. Charger Over Voltage Protection The input voltage is monitored by the internal comparator and the input over voltage protection threshold is set to 6.9V. However, input voltage over 28V will still cause damage to the RT8966H. When the input voltage exceeds the threshold, the comparator outputs a logic signal to turn off the power P-MOSFET to prevent high input voltage from damaging the electronics in the handheld system. When the input over voltage condition is removed, the comparator re-enables the output by running through softstart. Battery Charge Profile The RT8966H will then send an interrupt and register CHG bit, as shown in Table 10. Finally, INT_STA2 becomes 0 to indicate that the RT8966H has completed the charging. Recharge Phase : When any loading or event causes VBAT to drop or battery to discharge, the charger will automatically jump to the appropriate mode to recharge the battery. Pre-charge Mode Constant Current Mode Battery Charge Current Programmed Charge Current Constant Voltage Mode Recharge Phase 4.35V Battery Regulation Voltage threshold Precharge Threshold Battery Full CHG pull High Time Figure 1. Charging State of the Charger Function Pre-Charge Mode : Figure 1 shows the RT8966H charging state of the charging function. During a charge cycle, if the battery voltage is below the VPRECH threshold (typical value is 2.6V), the charger enters pre-charge mode. This feature revives deeply discharged cells and protects battery life. The precharge current has a typical value of 50mA. Constant Current Mode : Once the battery voltage is higher than 2.6V, the charger enters the constant current stage. The constant current level can be programmed from 90mA to 1A via the I2C compatible interface but the default value is 400mA. Copyright © 2015 Richtek Technology Corporation. All rights reserved. DS8966H-00 July 2015 Charger for Factory Mode The RT8966H provides factory mode for supplies up to 2.3A for powering external loads with no battery installed and VBAT is regulated to 4.35V. The factory mode allows the user to supply system power with no battery connected. It is programmable by I2C via the PTM bit, as shown in Table 13. In factory mode, thermal regulation is disabled, but thermal protection (135°C) is still active. When using currents greater than 1.5A in factory mode, the user must limit the duty cycle at the maximum current to 20% with a maximum period of 10ms. is a registered trademark of Richtek Technology Corporation. www.richtek.com 11 RT8966H Charger Sleep Mode Linear Regulator The RT8966H enters sleep mode if the power is removed from the input. This feature prevents draining the battery during absence of input supply. There are four LDOs in the RT8966H. These LDOs can be programmed via I2C in the following control registers Enable, OUT Set1, OUT Set2. These registers include each LDO's enable/disable control as well as its output voltage selection from 1V to 3.3V. Charger Temperature Regulation and Thermal Protection In order to maximize charge rate, the RT8966H features a junction temperature regulation loop. This allows the RT8966H to limit the charge current in order to maintain a junction temperature around the thermal regulation threshold (125°C). The RT8966H monitors the junction temperature, TJ, of the die and disconnects the battery from the input if TJ exceeds 125°C. This operation continues until junction temperature falls below thermal regulation threshold (125°C) by the hysteresis level. This feature prevents maximum power dissipation from exceeding typical design conditions. Charger Input and Output Capacitors Selection For most applications, a high frequency decoupling capacitor place near the input is usually sufficient. A 1μF ceramic capacitor, should work well. However, in other applications, depending on the power supply characteristics and cable length, it may be necessary to add an additional 10μF ceramic capacitor to the input. The RT8966H also requires a small output capacitor for loop stability. A typical 1μF ceramic capacitor placed between the VBATT pin and GND is sufficient. Input DPM Mode When USB sources are selected, the input voltage, VBUS, is monitored. If VBUS falls to VDPM, the input current limit is reduced to prevent the input voltage from falling further. This prevents the IC from crashing poorly designed or incorrectly configured USB sourced. EXPDET Linear Regulator The RT8966H integrates one low dropout linear regulator (LDO) that supplies up to 50mA of output current. The 2 LDO can be enabled by I C via the EXTPDET bit, as shown in Table 13. Note that the LDO current is independent and not monitored by the charge current limit. Copyright © 2015 Richtek Technology Corporation. All rights reserved. www.richtek.com 12 Linear Regulator Capacitor Selection In order to maintain regulator stability and performance, better quality ceramic capacitor, such as X7R/X5R, should be selected. Like any low-dropout regulator, the external capacitors used with the RT8966H must be carefully selected for regulator stability and performance. Use a capacitor with value larger than 1μF on the RT8966H input. The amount of capacitance can be increased without limit. The input capacitor should be located at a distance of not more than 0.5 inch from the input pin of the IC and returned to a clean analog ground. A capacitor with larger value and lower ESR (equivalent series resistance) provides better PSRR and line-transient response. The output capacitor must meet requirements for both minimum amount of capacitance and ESR in all LDOs application. The RT8966H is designed specifically to work with low ESR ceramic output capacitor for space-saving and performance consideration. Using a ceramic capacitor whose value is at least 1μF with ESR > 30mΩ on the RT8966H output ensures stability. The RT8966H still works well with output capacitor of other types due to the wide stable ESR range. Output capacitor with larger capacitance can reduce noise and improve load transient response, stability, and PSRR. The output capacitor should be located at a distance of not more than 0.5 inch from the OUTx pin of the RT8966H and returned to a clean analog ground. Current Source LED Driver There are four current source LED drivers in the RT8966H. These current sources can be programmed via I2C in the following control registers, Enable and LED Set. These registers include each driver's enable/disable control, source current control, and LED brightness dimming. is a registered trademark of Richtek Technology Corporation. DS8966H-00 July 2015 RT8966H The RT8966H provides a constant current for the white LEDs. Each channel supports up to 30mA current and regulates a constant current for uniform intensity. In order to maintain LED constant current, the input voltage must provide the required LED forward voltage and current source dropout voltage. If the forward voltage of the white LEDs is 3.3V, the input voltage should be higher than 3.4V to provide enough voltage headroom for maintaining constant brightness. I2C Control Interface The RT8966H uses an I2C to be the control interface. The I2C interface allows the host microprocessor to control the switches and the accessory detection ADC. The status of the device detection may be sent through the I2C bus. The interrupt line may also be used to signal a status change to the host microprocessor. The I2C interface and interrupt output are compliant with 1.8V logic voltage levels. The SCL pin is only an input and the SDA pin is an input or open drain output. The interrupt line is only an open drain output. I2C Device Address = 1000100x (where x is the read/write bit) Switches The RT8966H provides a multiple input multiplexer to support USB high Speed, UART, stereo audio, mono audio and a microphone. The output of the multiplexer is used to connect to a mini or micro USB connector. When the VBUS voltage is higher than the VB Detect threshold voltage, the RT8966H can turn on and turn off the paths of USB, UART and Audio. However, when the VBUS voltage is lower than the VB Detect threshold voltage, the RT8966H can then only turn on and turn off the paths of stereo audio and mono audio. The following table shows the switch status versus VBUS level. VBUS = High VBUS = Low USB Switches Allow Not Allow UART Switches Allow Not Allow Audio Switches Allow Allow The default startup of the RT8966H can be set as USB or UART according to the voltage at the DSS pin. The voltage on the DSS pin will be sampled immediately once the Copyright © 2015 Richtek Technology Corporation. All rights reserved. DS8966H-00 July 2015 first power supply is attached to the RT8966H through VB or BAT and is latched by the first rising voltage on the SCL pin. The DSS pin voltage controls the switch state during this period. If the voltage of the DSS pin rises or falls below 0.4V before the first rising edge on the SCL pin, the switch state will be changed between USB or UART positions. When the DSS pin voltage is below 1V, the default startup will be USB. If the DSS pin voltage is greater than 1V, the UART will be set as the default startup. The DSS pin provides an internal 300kΩ pull down resistor for USB startup. The DSS pin can also be left unconnected or connected to GND. For UART startup, connect the DSS pin with an external 300kΩ resistor to BAT. Multiplexer Inputs DN/DP : These two pins can support all speed ranges of the USB including USB high speed, full Speed, low speed and UART signals from 0V to 3.3V. In order to function, the CP_EN bit in the register must be set to 1 when signals pass through the switch. DN/DP channel of the RT8966H will be routed to the D−/D+ lines on a mini/micro USB connector. U1/U2 : These two pins can also support the speed range of the USB including USB full speed, low speed and UART signals from 0V to 3.3V. Similarly, the CP_EN bit must be set to 1 when signals pass through the switch. U1/U2 channel of the RT8966H will be routed to D−/D+ lines on a mini/micro USB connector. Voice Audio : The RT8966H can support one mono microphone in which the signal is routed to the ID line. For routing to a headset, the microphone audio will be used with the stereo audio input. CP_EN must be 1 when signals pass through the switch. Stereo Audio : The RT8966H supports a stereo audio amplifier connected with a mono microphone. The LEFT and RIGHT channel audio of the RT8966H is routed to the D+ and D− lines on the mini/micro USB connector, while the microphone is routed to the ID line on the mini/micro is a registered trademark of Richtek Technology Corporation. www.richtek.com 13 RT8966H USB connector. The RT8966H provides internal 100kΩ shunt resistors on the AUD1 and AUD2 speaker lines. Those resistors are used to reduce pops and clicks when the audio amplifier is switched on due to the ac coupling capacitors. If a Direct Drive audio amplifier is adopted, the 100kΩ switched shunt resistors can be removed. CP_EN must be 1 when signals pass through the switch. Multiplexer Output with High Impedance Mode The RT8966H provides an I2C control to set the D-, D+ and ID pins in high impedance condition. CP_EN must be 1 when the multiplexer output is connected to high impedance. The D-, D+ and ID pin of the multiplexer outputs must always be connected to the D−,D+ and ID pin of the mini/micro USB connector respectively. This allows the D-, D+ and ID pins to maintain in a “safe” position when a headset is inserted. If the D-, D+ switches are left connected to one of the 4 inputs, it is possible that a dc voltage will be present to cause a pop in the speakers. Enable Power Saving Mode The RT8966H provides multiple power saving modes. The power saving mode is used to turn off the internal LDO, charge pump and comparator when not in use. The VB OVP will not be affected by any power saving mode. The RT8966H provides three I2C bits for power saving operation. CP_EN : CP_EN is used to control the charge pump to achieve proper operation of the analog switches. This bit must be set to 1 when a signal passes through a switch and also any time a negative rail signal is connected to an audio switch input (AUD1, AUD2). The charge pump provides low on-resistance for the switches when they are in conduction condition. ADC_EN : ADC_EN is used to control the internal ADC and the ID LD0. When this bit is set to disable, the ADC bits will be 0000 and no interrupt signal will be generated. Any pending interrupt signals arising from the change in ADC value will not be cleared unless a READ is sent manually to the STATUS register. SEMREN : This bit controls the internal comparators used for the SEND/END switch, microphone removal and the ID LDO. When this bit is set to disable, the SE_COMP and MR_COMP registers will be set to zero and no interrupt Copyright © 2015 Richtek Technology Corporation. All rights reserved. www.richtek.com 14 signal will be generated. Any pending interrupt signals arising from the change in the SE_COMP and MR_COMP comparators will not be cleared. It can only be cleared manually by sending a READ to the STATUS register. (ID LDO Enable = ADC_EN or SEMREN) Microphone Power Saving Mode The microphone can draw a large current due to the typical 2.2kΩ bias resistor when it is plugged in. This current will be dissipated even if the microphone is not used for audio input (not in a call or voice recorder not in use, etc.) This is done to allow for the SEND/END button detection's operation. The RT8966H provides a method to reduce the drawn current by turning off the 2.2kΩ pull up resistor. This resistor will be turned on only for short durations to check whether the SEND/END was being pressed. The detail of the microphone power saving circuit is shown in Figure 2. When the external 2.2kΩ resistor is turned off, the internal 200kΩ resistor will be turned on to immediately detect a microphone removal event once it occurs. When the register bit MIC_LP = 1, an interrupt signal will be generated for both a microphone removal (MR_COMP) event and a SEND/END button detection (SE_COMP). 2.3V Pulse Generator 2.3V 2.3V 100k - MR_COMP + 800k 2.2k 200k - SE_COMP Microphone + 100k SENG /END 12pF Figure 2. The Microphone Power Saving Circuit of the RT8966H Event Detection and Interrupt Generation When a specific event occurs, the RT8966H will be able to detect it and then will generate an interrupt signal. The above-mentioned specific events include CHGDET, MR_COMP, SE_COMP, VBUS and IDNO. For details of those specific events, please refer to Table 9, under is a registered trademark of Richtek Technology Corporation. DS8966H-00 July 2015 RT8966H “INT_STA1 0x04”. If the ADC reads and detects that there is a plugged device with an ID resistor or microphone present, an interrupt signal will be generated. If a device is removed and the ADC reads a high voltage on the ID line, an interrupt signal is generated. If the voltage on the VB pin rises above or drops below the VB detect threshold, VDET_VB for the detection/removal of an USB cable, an interrupt signal will also be generated. Interrupt will also be generated once the status changes on the SE_OMP and MR_COMP comparators. The interrupt signal will be cleared by reading the STATUS register. The interrupt signal is triggered by different levels and the interrupt polarity can be set through the I2C bus. CHGDET : Charger Detection The RT8966H is compliant with the USB Battery Charging Specification Revision 1. The RT8966H is capable of detecting dedicated chargers, host/hub chargers and standard USB port. The RT8966H USB detection function is off (USB_DET_DIS = 1) by default and requires an I2C WRITE to enable the detection. The RT8966H charger detection includes internal logic to allow valid charger detection (D+/D− shorted for host/hub charger) and an external open drain for automatic ISET signal generation. The charger detection sequence is started once VBUS rises above VDET_VB. However, the charge detection will not be activated if the cable ID resistor value is 56kΩ since this value is already designated as the UART cable. Besides, it can only be started if the USB_DET_DIS bit is equal to 0. When VDAT_SRC is applied to D+, the VDAT_SRC voltage will also be applied to the D− line by the dedicated charger since D+ and D− are shorted. The dedicated charger detection is shown in Figure 3. As for the host/hub charger, D+ receives VDAT_SRC and retransfers it on D−. Thus, it acts similarly to the dedicated charger. The host/hub charger detection is shown in Figure 4. However, when a standard USB port is inserted instead, the D− will not receive the VDAT_SRT after D+ sends out the VDAT_SRT signal. The standard USB port is shown in Figure 5. It is through such method that the RT8966H differentiates between a standard USB port and a charger port. (either dedicated charger or host/hub charger). current host/hub can be achieved by the manual operation started with an I2C WRITE. After an interrupt signal is sent to the host, it reads the IN_STAT register which can be used to set the CHGDET and VBUS bits (USB high current host/hub or dedicated charger detected). The host will set the CHG_TYP bit to perform the type detection. The detection is achieved by connecting a high value pull up resistor (300k to 600k) to D+. If D− stays low (below 0.8V), a high current hub/host is detected. A dedicated charger will be detected if D− goes high. The output of this detection is two bits in the STATUS register. The CHGDET bit in INT_STAT rather than the interrupt signal is guaranteed by the register. After the charger type detection is completed, the CHG_TYP bit will automatically reset to 0. The ISET pin of the RT8966H is an external open-drain connected to an external charger to indicate whether the inserted USB is a charger or not. When the inserted one is a standard USB port, the ISET pin will be high impedance. When the inserted one is a charger (dedicated charger or host/hub charger), the ISET pin will be pulled low. ISET controls the external battery charger current limit. If ISET is high impedance, the charger current will be limited at 100mA. If ISET is low, then the charger current is allowed to be drawn up to 1.5A. RT8966H VBUS Dedicated Charger D+ DID GND Figure 3. Dedicated Charger Detection RT8966H VBUS D+ Host or Hub RDAT_LKG VDAT_LKG PHY / Link RDAT_DWN_15k DID RDAT_LKG VDAT_LKG GND RDAT_DWN_15k The distinction between a dedicated charger or a high Figure 4. Host/Hub Charger Detection Copyright © 2015 Richtek Technology Corporation. All rights reserved. DS8966H-00 July 2015 is a registered trademark of Richtek Technology Corporation. www.richtek.com 15 RT8966H Host Charger or Hub Charger RT8966H VBUS D+ RDAT_LKG VDAT_LKG RDAT_DWN_15k VDAT_REF VDAT_DET - PHY / Link + VDAT_SRC IDAT_SINK DRDAT_LKG VDAT_LKG ID GND RDAT_DWN_15k Figure 5. Standard USB Port MR_COMP, SE_COMP : Microphone Removal Detection and Send/End Switch The RT8966H provides MR_COMP for microphone removal detection and SE_COMP for Send/End switch detection by checking the voltage on ID when a microphone is detected on the ID pin. A bias resistor (typical 2.2k) should be connected between ID and a bias voltage source (typical 2.3V). When the microphone is not connected, the ID pin voltage will be pulled high to equal the bias voltage and the comparator will detect this voltage rise. The microphone removal threshold voltage will be 90% of the microphone bias voltage. There is a switch included in the headset which is connected between the ID line and ground to signal a SEND or END condition. The voltage drop of the ID line will be detected by an internal comparator with a typical threshold of 10% bias voltage source. If the voltage on the ID pin rises above the microphone removal threshold voltage or drops below the SEND/END threshold, the host microprocessor will read the status of these comparators across the I2C bus. An ID voltage >90% means the microphone is removed, an ID voltage <10% means push, and an ID voltage between 10% to 90% means the microphone is plugged. VBUS : VB Voltage Detection When the VB voltage is lower than VDET_VB, the VBUS bit will be equal to 0. If the VB voltage is higher than VDET_VB, the VBUS bit will be equal to 1. Device Identification The RT8966H supports multiple accessories by detecting unique characteristics, such as VBUS voltage, ID resistor value and shorted USB data lines. These characteristics are shown in Tables 1 to 3. The detection of connected accessories is performed by using an internal 200kΩ pull up resistor. Table 1. Detection Values With 200kΩ Ω pull up ADC Value ADC Voltage ID Resistor k D+ Condition D Condition 1011 100% Open 15k to GND 15k to GND 1011 100% Open Shorted Shorted 1010 81.90% 910 --1001 75.60% 620 --1000 68.20% 430 --0111 62.20% 330 --0110 54.50% 240 --0101 47.40% 180 Shorted Shorted 0100 39.40% 130 --0011 33.30% 100 --0010 21.90% 56 TX RX 0001 10.70% 24 Audio Audio 0000 0% -Speaker Speaker 0000 0% GND D+ D 0000 0% 75 Audio Audio Copyright © 2015 Richtek Technology Corporation. All rights reserved. www.richtek.com 16 VBUS 5 5 -----5 --5 ----- Function USB Cable TA Charger Reserved Reserved Reserved Reserved Reserved LG Proprietary TA UART Factory Reserved UART Cable Video - no load Microphone USB OTG Video - with load is a registered trademark of Richtek Technology Corporation. DS8966H-00 July 2015 RT8966H Table 2. Detection Values With 2.2kΩ Ω Pull Up ADC Value ADC Voltage ID Resistor k D+ Condition D Condition VBUS Function 1011 100% Open -- -- -- -- 1011 100% Open -- -- -- -- 1010 81.90% -- -- -- -- Microphone 1001 75.60% -- -- -- -- Microphone 1000 68.20% -- -- -- -- Microphone 0111 62.20% -- -- -- -- Microphone 0110 54.50% -- -- -- -- Microphone 0101 47.40% -- -- -- -- Microphone 0100 39.40% -- -- -- -- Microphone 0011 33.30% -- -- -- -- Microphone 0010 21.90% -- -- -- -- Microphone 0001 10.70% -- -- -- -- Microphone 0000 0% 75 Audio Audio -- Video - with load 0000 0% GND D+ D -- USB OTG VBUS Function Table 3. Detection Values With 620Ω Ω Pull Up ADC Value ADC Voltage ID Resistor k D+ Condition D Condition 1011 100% Open -- -- -- -- 1011 100% -- -- -- -- -- 1010 81.90% -- -- -- -- -- 1001 75.60% -- -- -- -- -- 1000 68.20% -- -- -- -- -- 0111 62.20% -- -- -- -- -- 0110 54.50% -- -- -- -- -- 0101 47.40% -- -- -- -- -- 0100 39.40% -- -- -- -- -- 0011 33.30% -- -- -- -- -- 0010 21.90% -- -- -- -- -- 0001 10.70% 75 Audio Audio -- Video - with load 0000 0% GND D+ D -- USB OTG Copyright © 2015 Richtek Technology Corporation. All rights reserved. DS8966H-00 July 2015 is a registered trademark of Richtek Technology Corporation. www.richtek.com 17 RT8966H I2C Register Information Table 4. Address : 1000100x Address Name Bit7 Device ID 0x00 0x01 0x02 Bit6 Bit5 0x05 0 0 0 0 1 Read/Write R R R R R R R R Control1 Reserved ID_2P2 ID_620 ID_200 Reset Value 0 0 0 0 0 0 0 1 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Control2 INTPOL INT_EN MIC_LP Reset Value 0 0 0 0 0 0 0 1 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W CP_AUD Reserved Reserved CHG_TYP USB_DET_DIS DP2 DN1 0 0 0 0 0 0 0 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W VBUS INDO Reset Value N/A N/A N/A N/A N/A N/A N/A N/A Read/Write R R R R R R R R INT_STA2 CHG TSHD TMD OVLO Reset Value N/A N/A N/A N/A N/A N/A N/A N/A Read/Write R R R R R R R R CHG_STAT UVLO Reserved Reserved Reserved Reserved Reserved Reserved C1COMP Reset Value 0 0 0 0 0 0 0 1 Read/Write R R R R R R R R Reserved Reserved Reserved Reserved TMP_STAT Reserved Reset Value 0 0 0 0 0 0 0 0 Read/Write R R R R R R R R PTM CHG_OFF Reserved Reserved IPRE_CHG Reset Value 1 1 0 0 1 0 0 0 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W CHG_SET Reserved IMIN_SET Reset Value 0 0 1 0 0 0 0 1 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W OUT1_EN OUT2_EN OUT3_EN OUT4_EN LED1_EN LED2_EN LED3_EN LED4_EN Reset Value 0 0 0 0 0 0 0 0 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W OUT Set 1 0x0B CP_EN 0 Enable 0x0A VLDO SEMREN ADC_EN Reset Value CHG_Ctrl2 0x09 CHIP_REV 1 CHG_Ctrl1 CHG_EN EXPDET 0x08 Bit0 0 STATUS2 0x07 Bit1 0 STATUS1 DCPORT CHPORT 0x06 Bit2 Reset Value INT_STA1 CHGDET MR_COMP SEND/END 0x04 Bit3 VENDOR_ID SW Control Reserved MIC_ON 0x03 Bit4 OUT1_SET OUT2_SET Reset Value 0 0 0 0 0 0 0 0 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Reset Value 0 0 0 0 0 0 0 0 Copyright © 2015 Richtek Technology Corporation. All rights reserved. www.richtek.com 18 is a registered trademark of Richtek Technology Corporation. DS8966H-00 July 2015 RT8966H Address Name Bit7 Bit6 OUT Set 2 0x0C Bit4 Bit1 Bit0 Reset Value 0 0 0 0 0 0 0 0 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W LED_FS LED_DIM Reset Value 1 0 0 1 1 1 1 1 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W MUIC Reset Value 0 0 0 0 0 0 0 0 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Charge / LED / LDO TEST2 0x0F Bit2 OUT4_SET TEST1 0x0E Bit3 OUT3_SET OUT Set 2 0x0D Bit5 Reset Value 0 0 0 0 0 0 0 0 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Table 5. Device ID 0x00 − Read Only Address Name 0x00 Device ID Bit7 Bit6 Bit5 Bit4 Bit3 VENDOR_ID Bit2 Bit1 Bit0 CHIP_REV Reset Value 0 0 1 0 0 0 0 1 Read/Write R R R R R R R R VENDOR_ID CHIP_REV Vendor Identification : Richtek : 1000b Chip Revision Copyright © 2015 Richtek Technology Corporation. All rights reserved. DS8966H-00 July 2015 is a registered trademark of Richtek Technology Corporation. www.richtek.com 19 RT8966H Table 6. Control1 0x01 − Read/Write Address Name 0x01 Control1 Bit7 Bit6 Bit5 Reserved ID_2P2 ID_620 Bit4 Bit3 Bit2 Bit1 Bit0 ID_200 VLDO SEMREN ADC_EN CP_EN Reset Value 0 0 0 0 0 0 0 1 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W ID_2P2 Connects the internal ID LDO Output to the RES pin. Used to connect an external microphone bias resistor to USB ID. 0 : Disabled (Open) 1 : Enabled (Connect) ID_620 Connects an internal 620 resistor between the internal ID LDO Output and USB ID. 0 : No resistor (Open) 1 : Resistor connected ID_200 Connects an internal 200k resistor between the internal ID LDO Output and USB ID. 0 : No resistor (Open) 1 : Resistor connected VLDO Sets the voltage on the ID LDO . 0 : 2.6V 1 : 2.3V SEMREN Enables the SEND/END, Microphone Removal comparators and the ID LDO . 0 : Disabled 1 : Enabled ADC_EN Enables the internal ADC and ID LDO. 0 : Disabled 1 : Enabled CP_EN Enables the charge pump required for analog switch operation. Set to 1 when any signal is passed through the switch. When set to disable, there must be no signal connected to an audio input which goes below ground. 0 : Disabled 1 : Enabled Copyright © 2015 Richtek Technology Corporation. All rights reserved. www.richtek.com 20 is a registered trademark of Richtek Technology Corporation. DS8966H-00 July 2015 RT8966H Table 7. Control2 0x02 − Read/Write Address Name 0x02 Control2 Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 INTPOL INT_EN MIC_LP CP_AUD Reserved Reserved CHG_TYP USB_DET_DIS Reset Value 0 0 0 0 0 0 0 1 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W INTPOL INT_EN MIC_LP CP_AUD CHG_TYP USB_DET_DIS This bit sets the interrupt polarity 0 : Active low 1 : Active High Enables interrupt generation. When set to disabled, all pending interrupts are cleared and the INT pin will de-assert. 0 : Disable Interrupt 1 : Enable Interrupt Enables ID line pulsing for low power detection of the SEND/END key and microphone removal. This mode must only be enabled when a valid microphone has been detected and microphone audio is not required. 0 : Disabled 1 : Enabled This bit sets the position of the click/pop resistor on both AUD1 and AUD2 0 : Disabled 1 : Enabled Enables Charger Type Detection. Set this bit to determine between Dedicated USB Charger and High Current Host/Hub Chargers. 0 : Disabled 1 : Enabled Disables the USB Charger Detection. This bit must be set to 0 for a USB detection sequence to be run when VBUS is applied. 0 : Enabled 1 : Disabled Table 8. SW Control 0x03 − Read/Write Address 0x03 Name Bit7 Bit6 SW Control Reserved MIC_ON Reset Value 0 0 Read/Write MIC_ON Bit5 Bit4 Bit3 Bit2 0 0 DP2 0 0 DP2 This bit sets the position of the mux switch connected to D+ 000 : D+ connected to DP 001 : D+ connected to U2 010 : D+ connected to AUD2 011 : Future Use 100 to 111 : High Impedance DN1 This bit sets the position of the mux switch connected to D000 : D- connected to DN 001 : D- connected to U1 010 : D- connected to AUD1 011 : D- connected to C1COMP 100 to 111 : High Impedance DS8966H-00 July 2015 Bit0 DN1 R/W R/W R/W R/W R/W R/W This bit sets the position of the switch connecting MIC to ID 0 : Open 1 : ID Connected to MIC Copyright © 2015 Richtek Technology Corporation. All rights reserved. Bit1 0 0 R/W R/W is a registered trademark of Richtek Technology Corporation. www.richtek.com 21 RT8966H Table 9. INT_STA1 0x04 − Read Only Address Name 0x04 INT_STA1 Bit7 Bit6 CHGDET MR_COMP Bit5 Bit4 SEND/END VBUS Bit3 Bit2 Bit1 Bit0 INDO Reset Value N/A N/A N/A N/A N/A N/A N/A N/A Read/Write R R R R R R R R CHGDET Output of USB Charger Detection Comparator. This bit will be set to one if D+ > VDAT_REF for longer than 20ms. Any change in this bit triggers an interrupt. 0 : D+ < VDAT_REF or D+ > VLGC (High current charger not detected) 1 : VLGC > D+ > VDAT_REF (High current charger detected) MR_COMP Output from the Microphone Removal Comparator – only active for SEMREN = 1. Any change in this bit triggers an interrupt. 0 : ID voltage is less than VMICRDET or SEMREN = 0 1 : ID voltage is greater than VMICRDET SEND/END Output from the SEND/END Comparator – only active for SEMREN = 1. Any change in this bit triggers an interrupt. 0 : ID voltage is greater than VMICSEDET or SEMREN = 0 1 : ID voltage is less than VMICSEDET VBUS Any change in this bit triggers an interrupt. Active for ADC_EN = 1 or SEMREN = 1 0 : VBUS voltage is less than UVP or higher than OVP or ADC_EN = SEMREN = 0 1 : VBUS voltage is higher than UVP and lower than OVP INDO ADC Output. Any change in these bits triggers an interrupt. Only active for ADC_EN = 1. 0000 : GND 0001 : 24 0010 : 56 0011 : 100 0100 : 130 0101 : 180 0110 : 240 0111 : 330 1000 : 430 1001 : 620 1010 : 910 1011 : open or ADC_EN = 0 Copyright © 2015 Richtek Technology Corporation. All rights reserved. www.richtek.com 22 is a registered trademark of Richtek Technology Corporation. DS8966H-00 July 2015 RT8966H Table 10. INT_STA2 0x05 − Read Only Address Name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 0x05 INT_STA2 CHG TSHD TMP OVLO UVLO Reserved Reset Value N/A N/A N/A N/A N/A N/A N/A N/A Read/Write R R R R R R R R Reserved Reserved CHG 0 : Charging Current ICHG < IEOC or VBUS is absent. Once EOC occurs, CHG will be latched at “0” and can be reset to “1” by CHG_EN = 0 or CHG_OFF = 1. 1 : Charging Current ICHG > IEOC CHG is active High when CHG_EN = 1, CHG_OFF = 0 and VBUS > UVLO TSHD Thermal Shutdown 0 : Chip Temperature is lower than Threshold temp 1 : Chip Temperature is higher than Threshold temp 1 : TEMP_STAT < 2 : 0> change 0 : TEMP_STAT < 2 : 0> does not change TMP OVLO 0 : VBUS Voltage is lower than OVP Threshold Voltage 1 : VBUS Voltage is Higher than OVP Threshold Voltage UVLO 0 : VBUS Voltage is Higher than UVP Threshold Voltage 1 : VBUS Voltage is Lower than UVP Threshold Voltage Table 11. STATUS1 0x06 − Read Only Address 0x06 Name Bit7 Bit6 STATUS1 DCPORT CHPORT Bit5 Bit4 CHG_STAT Bit3 Bit2 Reserved Reserved Bit1 Bit0 Reserved C1COMP Reset Value 0 0 0 0 0 0 0 1 Read/Write R R R R R R R R DCPORT Indicates if a Dedicated USB Charger is Connected 0: No dedicated Charger 1: Dedicated Charger Detected CHPORT Indicates if a High Current Host/Hub is Connected 0: No dedicated HCHH 1: HCHH Detected CHG_STAT Charger Status 00: Charger is operating in Pre-charging status 01: Charger is operating in Fast-charging status 10: Charger is operating in CV Mode 11: Charging current is lower than EOC threshold C1COMP Output from the D- Comparator 0: D- voltage is less than VD-DET 1: D- voltage is greater than VD-DET Copyright © 2015 Richtek Technology Corporation. All rights reserved. DS8966H-00 July 2015 is a registered trademark of Richtek Technology Corporation. www.richtek.com 23 RT8966H Address Name 0x07 STATUS2 Bit7 Table 12. STATUS2 0x07 − Read Only Bit6 Bit5 Bit4 Bit3 TMP_STAT Bit2 Bit1 Bit0 Reserved Reserved Reserved Reserved Reserved Reset Value 0 0 0 0 0 0 0 0 Read/Write R R R R R R R R TMP_STAT Temperature detect and Alarm 000 : < 75°C 001 : 75 to 95°C 010 : 95 to 115°C 011 : 115 to 135°C 100 : > 135°C 101 to 111 : Reserved Table 13. CHG_Ctrl1 0x08 − Read/Write Address 0x08 Name Bit7 Bit6 CHG_Ctrl1 CHG_EN EXPDET Bit5 Bit4 Bit3 PTM CHG_OFF Bit2 IPRE_CHG Bit1 Bit0 Reserved Reserved Reset Value 1 1 0 0 1 0 0 0 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W CHG_EN EXPDET PTM CHG_OFF IPRE_CHG 0 : Disable Charging Path of Charger 1 : Enable Charging Path of Charger (CHG_OFF = 1 is not allow) 0 : Disable LDO Output of Charger 1 : Enable LDO Output of Charger (CHG_OFF = 1 is not allow) Production Test Mode 0 : Disable Test Mode 1 : Enable Test Mode (CHG_OFF = 1 or CHG_EN = 0 is not allow) 0 : Enable Charger Circuit 1 : Disable Charger Circuit and EXPDET and PTM mode Setting of Pre-charging Current of Charger 00 : Pre-charging Current = 40mA 01 : Pre-charging Current = 60mA 10 : Pre-charging Current = 80mA 11 : Pre-charging Current = 100mA Copyright © 2015 Richtek Technology Corporation. All rights reserved. www.richtek.com 24 is a registered trademark of Richtek Technology Corporation. DS8966H-00 July 2015 RT8966H Table 14. CHG_Ctrl2 0x09 − Read/Write Address Name Bit7 0x09 CHG_Ctrl2 Bit6 Bit5 Bit4 CHG_SET Bit3 Bit2 Reserved Bit1 Bit0 IMIN_SET Reset Value 0 0 1 0 0 0 0 1 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W CHG_SET Setting of Fast Charging Current of Charger 0000 : 90mA 0001 : 100mA 0010 : 400mA 0011 : 450mA 0100 : 500mA 0101 : 600mA 0110 : 700mA 0111 : 800mA 1000 : 900mA 1001 : 1000mA 1010 to 1111 : Reserved (1000mA) IMIN_SET Setting of End of Charge Current Ratio 000 : 5% 001 : 10% 010 : 16% 011 : 20% 100 : 25% 101 : 33% 110 : 50% 111 : Reserved (50%) Table 15. Enable 0x0A − Read/Write Address Name 0x0A Enable Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 OUT1_EN OUT2_EN OUT3_EN OUT4_EN LED1_EN LED2_EN LED3_EN LED4_EN Reset Value 0 0 0 0 0 0 0 0 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W OUT1_EN 0 : Disable LDO1 1 : Enable LDO1 OUT2_EN 0 : Disable LDO2 1 : Enable LDO2 OUT3_EN 0 : Disable LDO3 1 : Enable LDO3 OUT4_EN 0 : Disable LDO4 1 : Enable LDO4 LED1_EN 0 : Disable LED1 1 : Enable LED1 LED2_EN 0 : Disable LED2 1 : Enable LED2 LED3_EN 0 : Disable LED3 1 : Enable LED3 LED4_EN 0 : Disable LED4 1 : Enable LED4 Copyright © 2015 Richtek Technology Corporation. All rights reserved. DS8966H-00 July 2015 is a registered trademark of Richtek Technology Corporation. www.richtek.com 25 RT8966H Address Name 0x0B OUT Set 1 Bit7 Table 16. OUT Set1 0x0B − Read/Write Bit6 Bit5 Bit4 Bit3 OUT1_SET Bit2 Bit1 Bit0 OUT2_SET Reset Value 0 0 0 0 0 0 0 0 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W OUT1_SET Setting of LDO1 Output Voltage 0000 : 1.0V 0001 : 1.2V 0010 : 1.5V 0011 : 1.8V 0100 : 2.0V 0101 : 2.1V 0110 : 2.5V 0111 : 2.6V 1000 : 2.7V 1001 : 2.8V 1010 : 2.9V 1011 : 3.0V 1100 : 3.1V 1101 : 3.3V OUT2_SET Setting of LDO2 Output Voltage 0000 : 1.0V 0001 : 1.2V 0010 : 1.5V 0011 : 1.8V 0100 : 2.0V 0101 : 2.1V 0110 : 2.5V 0111 : 2.6V 1000 : 2.7V 1001 : 2.8V 1010 : 2.9V 1011 : 3.0V 1100 : 3.1V 1101 : 3.3V Copyright © 2015 Richtek Technology Corporation. All rights reserved. www.richtek.com 26 is a registered trademark of Richtek Technology Corporation. DS8966H-00 July 2015 RT8966H Table 17. OUT Set2 0x0C − Read/Write Address Name 0x0C OUT Set 2 Reset Value Read/Write OUT3_SET OUT4_SET Bit7 Bit6 Bit4 Bit3 OUT3_SET 0 0 0 R/W R/W R/W Setting of LDO3 Output Voltage 0000 : 1.0V 0001 : 1.2V 0010 : 1.5V 0011 : 1.8V 0100 : 2.0V 0101 : 2.1V 0110 : 2.5V 0111 : 2.6V 1000 : 2.7V 1001 : 2.8V 1010 : 2.9V 1011 : 3.0V 1100 : 3.1V 1101 : 3.3V Bit2 Bit1 Bit0 OUT4_SET 0 0 0 0 0 R/W R/W R/W R/W R/W Setting of LDO4 Output Voltage 0000 : 1.0V 0001 : 1.2V 0010 : 1.5V 0011 : 1.8V 0100 : 2.0V 0101 : 2.1V 0110 : 2.5V 0111 : 2.6V 1000 : 2.7V 1001 : 2.8V 1010 : 2.9V 1011 : 3.0V 1100 : 3.1V 1101 : 3.3V Copyright © 2015 Richtek Technology Corporation. All rights reserved. DS8966H-00 July 2015 Bit5 is a registered trademark of Richtek Technology Corporation. www.richtek.com 27 RT8966H Table 18. LED Set 0x0D − Read/Write Address Name 0x0D LED Set Reset Value Read/Write LED_FS LED DIM Bit7 Bit6 Bit5 Bit4 Bit3 LED_FS 1 Bit2 Bit1 Bit0 LED_DIM 0 0 R/W R/W R/W Setting of LED Full Scale Current 000 : 2.5mA 001 : 5mA 010 : 10mA 011 : 15mA 100 : 20mA (Default) 101 : 25mA 110 : 30mA 111 : Reserved (30mA) 1 1 1 1 1 R/W R/W R/W R/W R/W Setting of LED Full Scale Current 00000 : 32 steps (Maximum Brightness) 00000 : 31 steps : : 11111 : 0 steps (Default) (Minimum Brightness) Software Flowcharts Initialization Flowchart : Start Clear Switch Position Write Reg 0x03 = 0x24 (Open DN1/DP2) Initialization for Detecting Accessories Write Reg 0x01 = 0x12 (Enable 200K Pullup and ADC) Write Reg 0x02 = 0x50 (Enable Interrupt, set AUD Click/Pop resistor and enable USB Charger Detection) Wait for Interrupt Copyright © 2015 Richtek Technology Corporation. All rights reserved. www.richtek.com 28 is a registered trademark of Richtek Technology Corporation. DS8966H-00 July 2015 RT8966H Alarm Flowchart : Start Interrupt Received Read INT_STAT Reg 0x04 and 0x05 No 0x05 Change Yes TSHD = 1 Yes Thermal Shut-down No Yes TMD = 1 Temperature Alarm Read the 0x07 No Yes OVLO = 1 VBUS > OVLO No Yes UVLO = 1 VBUS < UVLO No CHG = 0 Yes Charging Down No 0x04 Change Yes Accessory Detection Flowchart No Wait for Interrupt Copyright © 2015 Richtek Technology Corporation. All rights reserved. DS8966H-00 July 2015 is a registered trademark of Richtek Technology Corporation. www.richtek.com 29 RT8966H Accessory Detection Flowchart : Start Exit Factory Mode Yes IDNO = 1011 Yes No Yes Factory Mode Previous Mode No No No Charger RemovedExit Charger Mode Yes Yes VBUS = 0 Charger Detect Flowchart Yes CHGDET = 1 Charger Mode No UART Factory Mode Write 0x02 = 0x51 (Enable Interrupt, set AUD (lick/pop) resistor and disable USB Charger Detection Write 0x03 = 0x09 (turn on UART switches) No No IDNO = 0100 USB Host or Headset removal Initialization Flowchart VBUS = 0 Yes No Yes No MRCOMP = 1 Yes Audio Mode Video Cable Mode-24k only C1COMP = 0 No Write 0x03 = 0x3B / Read 0x05 (Enable C1COMP) Yes VBUS = 1 No Factory Mode Flowchart No No SEND/END Button Pressed – goto SE Button routine Yes IDNO = 0010 Yes SECOMP = 1 Yes No Yes No Standard USB Host Detected Write 0x03 = 0x00 (turn on USB switches) Enable USB Transceiver Yes USB Mode D+/D- is Not contact No IDNO = 0001 Video Cable 24k Resistor Detected – No TV Attached Yes Yes No Video Cable Removed Yes IDNO > 0001 IDNO = 0000 No No No Accessory Not Supported Yes Write Reg 0x02 = 0x10 (Disable Interrupts) Write Reg 0x01 = 0x42 (Connect 2.2K external resistor) Read INT_STAT register 0x04 Yes IDNO = 0000 IDNO > 0000 Yes No Write Reg 0x01 = 0x22 (Connect 620 internal resistor) Read INT_STAT register 0x04 75 Detected - Enable Video Output Invalid Accessory Write 0x01 = 0x01 (Enable Charge Pump) Enable Audio AMP and Video Amp Write 0x02 = 0x40 (Enable Interrupts clear AUD click/pop resistors) Write 0x03 = 0x12 (connect COM to AUD) Enable Video Path Yes IDNO = 0001 No Audio Mode-Microphone Power Saving Mode Write 0x01 = 0x4D (Connect 2.2k, set LDO to 2.3V, enable SEMR comparators, enable Switch Charge pump) Enable Audio Amp Write 0x02 = 0x60 (Enable Interrupts and MIC_LP, clear AUD click/pop resistors) Write 0x03 = 0x12 (connect COM to AUD) Audio Mode Write 0x01 = 0x4D (Connect 2.2k, set LDO to 2.3V, enable SEMR comparators, enable Switch Charge pump) Enable Audio Amp Write 0x02 = 0x40 (Enable Interrupts, clear AUD click/pop resistors) Write 0x03 = 0x52 (connect MIC/ID Switch and COM to AUD) USB OTG Detected – Invalid Accessory Write 0x01 = 0x12 (Connect 200k) Write 0x02 = 0x50 (re-enable interrupts) Wait for Interrupt Copyright © 2015 Richtek Technology Corporation. All rights reserved. www.richtek.com 30 is a registered trademark of Richtek Technology Corporation. DS8966H-00 July 2015 RT8966H Charger Detection Flowchart : Start IDNO = 0101 Yes No LG Proprietary TA Detected (180kΩ on ID) Write Reg 0x08 = 0xCx (Enable Charger, and set pre-charging current) Write Reg 0x09 = 0xxx (Set Fast charging current, and EOC) Write 0x02 = 12 (Enable charger type detection, Disable Interrupts) Wait for 300ms Read STATUS 0x06 Dedicated Charger (TA) Detected Write Reg 0x08 = 0xCx (Enable Charger, and set pre-charging current) Write Reg 0x09 = 0xxx (Set Fast charging current, and EOC) Write 0x02 = 50 (Re-enable Interrupt) High Current Host/Hub Detected Write 0x03=0x00 (turn on USB switches) Enable USB Transceiver, Write Reg 0x08 = 0xCx (Enable Charger, and set pre-charging current) Write Reg 0x09 = 0xxx (Set Fast charging current, and EOC) Write 0x02 = 50 (Re-enable Interrupt) Yes DCPORT = 1 No Yes CHPORT = 1 No Return Copyright © 2015 Richtek Technology Corporation. All rights reserved. DS8966H-00 July 2015 is a registered trademark of Richtek Technology Corporation. www.richtek.com 31 RT8966H Factory Mode Flowchart : Start Write 0x01=0x13 (enable 200k, Charge Pump and ADC) Write 0x03=0x00 Enable USB Path Audio Mode Change No Yes Write 0x03 = 0x12 to Enable Audio Path MP3 Test No Call Test Other Test Yes Yes No No Wait for Interrupt Write 0x01 = 0x4D to Enable 2.3LDO and 2.2k mic bias Read Status 0x04 Wait for Interrupt IDNO = 0000 SE_COMP = 1 Wait for Interrupt No SE_COMP = 1 Yes Yes Write 0x03 = 0x00 to Enable USB Path Yes No Call Disconnect Wait for Interrupt Call Connect Yes No SE_COMP = 1 Yes Write 0x01 = 0x12 Enable 200k and ADC Write 0x03 = 0x00 Enable USB Path Copyright © 2015 Richtek Technology Corporation. All rights reserved. www.richtek.com 32 is a registered trademark of Richtek Technology Corporation. DS8966H-00 July 2015 RT8966H RT8966H Internal Logic Flowchart Case 1.1 Accessory without VBUS Flowchart : No ADC_EN = 1 & ID_200 = 1 Yes No ID Change Yes Deglitch tCHGR_DET_DBNC INDO change Send INT Case 1.2 Accessory without VBUS Signal Sequence : tCHGR_DET_DBNC External Signal ID INT 2 I C Register Table INDO Copyright © 2015 Richtek Technology Corporation. All rights reserved. DS8966H-00 July 2015 is a registered trademark of Richtek Technology Corporation. www.richtek.com 33 RT8966H Case 2.1 Accessory with VBUS Flowchart : No ADC_EN or SEMREN = 1 USB_DET_DIS = 0 No VBUS_PG UVP = OVP = 0 Yes Deglitch tCHGR_DET_DBNC Send 2.6V to D+ Send INT No D+ < 1.2V Yes Deglitch tCHGR_DET_DBNC D+/D- Connect Send VDAT_SRC to D+ tDP_SRC_ON VBUS = 1, CHGDET = 0 Send INT No D- > VDAT_REF Yes VBUS = 1, CHGDET = 1 Send INT Copyright © 2015 Richtek Technology Corporation. All rights reserved. www.richtek.com 34 is a registered trademark of Richtek Technology Corporation. DS8966H-00 July 2015 RT8966H Case 2.2 Accessory with VBUS Signal Sequence : ID Voltage Dischange External Signal ID tCHGR_DET_DBNC ID Voltage Change 2 VBUS After I C Read 0x04 & 0x05 tCHGR_DET_DBNC 2 After I C Read 0x04 & 0x05 tCHGR_DET_DBNC INT 2.6V 0.6V D+ <1.2V tDP_SRC_ON 2 I C Register Table UVP CHG VBUS CHGDET INDO ID Voltage Change ID Voltage Dischange Copyright © 2015 Richtek Technology Corporation. All rights reserved. DS8966H-00 July 2015 is a registered trademark of Richtek Technology Corporation. www.richtek.com 35 RT8966H Charger Internal Logic Flowchart : CHG_OFF = 0 No Charger, PTM, and EXPDET are off. Yes No CHG_EN = 1 PTM and Charger are off. Yes PTM = 1 No Charger is on. PTM is off. Yes Charger is off. PTM is on. Copyright © 2015 Richtek Technology Corporation. All rights reserved. www.richtek.com 36 is a registered trademark of Richtek Technology Corporation. DS8966H-00 July 2015 Thermal Considerations For continuous operation, do not exceed absolute maximum junction temperature. The maximum power dissipation depends on the thermal resistance of the IC package, PCB layout, rate of surrounding airflow, and difference between junction and ambient temperature. The maximum power dissipation can be calculated by the following formula : PD(MAX) = (TJ(MAX) − TA) / θJA where TJ(MAX) is the maximum junction temperature, TA is the ambient temperature, and θJA is the junction to ambient thermal resistance. For recommended operating condition specifications, the maximum junction temperature is 125°C. The junction to ambient thermal resistance, θJA, is layout dependent. For WQFN-32L 4x4 packages, the thermal resistance, θJA, is Maximum Power Dissipation (W)1 RT8966H 4.0 Four-Layer PCB 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 25 50 75 100 125 Ambient Temperature (°C) Figure 6. Derating Curve of Maximum Power Dissipation 27.8°C/W on a standard JEDEC 51-7 four-layer thermal test board. The maximum power dissipation at TA = 25°C can be calculated by the following formula : PD(MAX) = (125°C − 25°C) / (27.8°C/W) = 3.59W for WQFN-32L 4x4 package The maximum power dissipation depends on the operating ambient temperature for fixed T J(MAX) and thermal resistance, θJA. The derating curve in Figure 6 allows the designer to see the effect of rising ambient temperature on the maximum power dissipation. Copyright © 2015 Richtek Technology Corporation. All rights reserved. DS8966H-00 July 2015 is a registered trademark of Richtek Technology Corporation. www.richtek.com 37 RT8966H Outline Dimension 1 1 2 2 DETAIL A Pin #1 ID and Tie Bar Mark Options Note : The configuration of the Pin #1 identifier is optional, but must be located within the zone indicated. Dimensions In Millimeters Dimensions In Inches Symbol Min Max Min Max A 0.700 0.800 0.028 0.031 A1 0.000 0.050 0.000 0.002 A3 0.175 0.250 0.007 0.010 b 0.150 0.250 0.006 0.010 D 3.900 4.100 0.154 0.161 D2 2.650 2.750 0.104 0.108 E 3.900 4.100 0.154 0.161 E2 2.650 2.750 0.104 0.108 e L 0.400 0.300 0.016 0.400 0.012 0.016 W-Type 32L QFN 4x4 Package Richtek Technology Corporation 14F, No. 8, Tai Yuen 1st Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Richtek products are sold by description only. Richtek reserves the right to change the circuitry and/or specifications without notice at any time. Customers should obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. Richtek cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Richtek product. Information furnished by Richtek is believed to be accurate and reliable. However, no responsibility is assumed by Richtek or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Richtek or its subsidiaries. www.richtek.com 38 DS8966H-00 July 2015