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Southchip SC8913 EVM User Manual

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SC8913 EVM USER GUIDE
——Southchip Semiconductor

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  • Page 1 SC8913 EVM USER GUIDE ——Southchip Semiconductor...

  • Page 2: Fundamental Information

    SOUTHCHIP CONFIDENTIAL Fundamental Information SC8913 EVM board is used for SC8913 which is featured with high efficiency, bi-direction operation (buck charger/boost discharger), and integrated MOSFET. User can configure parameters flexibly through I2C interface on the SC8913 EVM board. Besides, the charging/discharging function and all chip performance can be evaluated with EVM board.
  • Page 3 Switching node test point 1.1 I2C Configuration SC8913 has an I2C control interface. The user can configure charging/discharging operation, switching frequency, charging target voltage, input regulation voltage (VINREG) in charging mode, VBUS voltage in Copyright © 2018, Southchip Semiconductor Technology (Shanghai) Co., Ltd...
  • Page 4 1.1.1 SouthChip I2C GUI Tool Guidance I2C GUI Tool is developed by SouthChip, convenient for customers to debug. When VBUS is decided by external configuration, the Rup and Rdown values marked with red color on the lower part of the interface should be filled according to the actual resistance on EVM. In this way, the voltage value shown in blue marker 1 is the true VBUS voltage value.
  • Page 5 0: internal setting (default) 1: external setting CSEL Battery cell selection, only valid for internal VBAT voltage setting 00: 1S battery (default) 01: 2S battery 10: 3S battery 11: 4S battery Copyright © 2018, Southchip Semiconductor Technology (Shanghai) Co., Ltd...
  • Page 6 The VBUS external reference voltage can be calculated as below. The adjustable reference voltage range is 0.7V~2.048V, the default value is 1V. VBUSREF_E = (4 x VBUSREF_E_SET + VBUSREF_E_SET2 + 1) x 2 mV Copyright © 2018, Southchip Semiconductor Technology (Shanghai) Co., Ltd...
  • Page 7 VBUS voltage is pulled low. Once the IC detects the VBUS voltage drops at VINREG threshold, it reduces the charging current automatically and regulates the VBUS voltage at VINREG threshold. VINREG value is decided by: VINREG_SET and VINREG_RATIO. VINREG_SET: Reg 0x07<7:0> VINREG_RATIO: Reg 0x09<4> Copyright © 2018, Southchip Semiconductor Technology (Shanghai) Co., Ltd...
  • Page 8 ADIN_VALUE2: set by Reg 0x16<7:6> Note: when the chip is set as standby mode (PSTOP = H), user shall set the Reg 0x0C<5> (ADC_START) to 0 to disable ADC function, reducing the quiescent current. Copyright © 2018, Southchip Semiconductor Technology (Shanghai) Co., Ltd...

  • Page 9: Other Settings

    Otherwise, the CC load will pull the output voltage down directly. If CR mode loading is used, even if the input / output current limit occurs, the output voltage still can be stabilized at a balance point and will not be forced down. Copyright © 2018, Southchip Semiconductor Technology (Shanghai) Co., Ltd...
  • Page 10 Capacitor, X5R, 0603, 10V, C16, C23 100nF/10V GRM188R61C104KA01# Murata 10%, 100nF Capacitor, X5R, 0603, 25V, C18, C24 1uF/25V GRM185R61E105KA12# Murata 10%, 1uF C19, C20, C26 1uF/10V GRM185R61A105KE26# Murata Capacitor, X5R, 0603, 10V, Copyright © 2018, Southchip Semiconductor Technology (Shanghai) Co., Ltd...
  • Page 11 R8, R12, R17, R18, R22, R23, R24, R25 Resistor, 0603, 1/4W, 1% R9, R10 Resistor, 0603, 1/4W, 1% Resistor, 0603, 1/4W, 1% Resistor, 0603, 1/4W, 1% test point SC8913 SC8913 Southchip Copyright © 2018, Southchip Semiconductor Technology (Shanghai) Co., Ltd...

  • Page 12: Pcb Layout

    SC8913 EVM USER GUIDE SOUTHCHIP SEMICONDUCTOR SOUTHCHIP CONFIDENTIAL PCB Layout SC8913 EVM board PCB layout is as follow: Figure 4 Top Silkscreen Figure 5 Top Layer Copyright © 2018, Southchip Semiconductor Technology (Shanghai) Co., Ltd...
  • Page 13 SC8913 EVM USER GUIDE SOUTHCHIP SEMICONDUCTOR SOUTHCHIP CONFIDENTIAL Figure 6 Mid Layer1 Figure 7 Mid Layer2 Copyright © 2018, Southchip Semiconductor Technology (Shanghai) Co., Ltd...
  • Page 14 SC8913 EVM USER GUIDE SOUTHCHIP SEMICONDUCTOR SOUTHCHIP CONFIDENTIAL Figure 8 Bottom Layer Figure 9 Bottom Silkscreen Copyright © 2018, Southchip Semiconductor Technology (Shanghai) Co., Ltd...
  • Page 15 VBUS = 5V, IBUS= 0A, PFM VBUS = 5V, IBUS= 0A, PWM VBUS = 5V, IBUS= 3A VBUS = 9V, IBUS= 2A VBUS = 12V, IBUS= 1.5A VBUS = 12V, IBUS= 2A Copyright © 2018, Southchip Semiconductor Technology (Shanghai) Co., Ltd...
  • Page 16 5.3 VBUS Voltage Dynamic Scaling in Discharging Mode fsw = 300kHz, L = 2.2uH, RS1 = 10mR, RS2 = 5mR, COMP = 10k + 22nF, Loop bit=1, VBAT=3.6V IBUS=0A, VBUS = 5~12V, Slew-Rate=2mV/uS IBUS=0A, VBUS = 12~5V, Slew-Rate=2mV/uS Copyright © 2018, Southchip Semiconductor Technology (Shanghai) Co., Ltd...
  • Page 17 = 300kHz, L = 2.2uH, RS1 = 10mR, RS2 = 5mR, COMP = 10k + 22nF, VBAT=3.6V Charge/discharge mode, VBUS = 5~12V, Set Charge/discharge mode, VBUS = 5~12V, Set IBUS_LIM=2A IBAT_LIM=3A Copyright © 2018, Southchip Semiconductor Technology (Shanghai) Co., Ltd...
  • Page 18 PSTOP=3.3V, VBUS floating, AD_START=0 Measure I_SB_VBAT=48.2uA current into VBAT (Note: VBUS resistor divider consumes 30uA because VBAT flows through body diode to VBUS) PSTOP=3.3V, VBUS floating, Measure current into I_SB_VBAT_ADC=495uA VBAT, AD_START=1 Copyright © 2018, Southchip Semiconductor Technology (Shanghai) Co., Ltd...

  • Page 19: Charging Curve

    VBUS=12V, IBUS=2A, Temperature rise of IC surface T_RISE=41°C 5.8 Charging Curve fsw = 300kHz, L = 2.2uH, RS1 = 10mR, RS2 = 5mR, COMP = 10k + 22nF Charging mode, VBUS = 5V, Set IBUS_LIM=2A, VBAT=2~4.2V Copyright © 2018, Southchip Semiconductor Technology (Shanghai) Co., Ltd...
  • Page 20 (Note: VBUS resistor divider consumes 40uA, due to VBAT VBUS=5V, PSTOP=3.3V, AD_START=0 flowing through body diode to VBUS) VBUS standby current: I_SB_VBUS_ADC =633uA VBUS=5V, PSTOP=3.3V, AD_START=1 VBUS supply current: IQ_VBUS=1.97mA VBUS=5V, PSTOP=0V Copyright © 2018, Southchip Semiconductor Technology (Shanghai) Co., Ltd...

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