Click here for production status of specific part numbers. MAX20353 Evaluation Kit Evaluates: MAX20353 1) Connect the GPIO controller device PFN1 (J2 pin 11). General Description Set the output to low. The MAX20353 evaluation kit (EV kit) is a fully assembled Optional: If a GPIO controller is unavailable, connect and tested circuit for evaluating the MAX20353 wearable a 10k pullup resistor from PFN1 to BAT (J1 pin 4). 2 charge-management solution with I C compatibility for 2 2) Connect the I C controller device to GND (J1 pins 1 and feature-rich, low-power wearable applications. The device 12, J2 pins 1 and 12), SDA (J2 pin 6) and SCL (J2 pin 7). includes a linear battery charger, smart power selector, 3) Set the power supply voltage to 3.7V and turn off the two ultra-low quiescent current buck regulators, a buck- supply. boost regulator, a boost regulator, a charge pump, two 4) Connect the positive terminal of the 3.7V to V BAT low-dropout (LDO) linear regulators, three LED current and the negative terminal to GND. sinks, five GPIO pins, and an LRA/ERM compatible haptic 5) Turn on the 3.7V power supply. driver with internal pattern storage. 2 6) Turn on the GPIO controller device and the I C Refer to the MAX20353 IC data sheet for detailed infor- controller device. mation regarding the operation and features of the device. 7) Set the GPIO controller output high to enable the MAX20353. Features 8) Measure the voltage on SYS (J1 pin 3 and J5 pin RoHS Compliant 1) and confirm it equals V . If the SYS voltage is BAT less than 2.7V, set the GPIO controller low for three Proven PCB Layout seconds, then set it back to high. Fully Assembled and Tested Optional: If using a 10k pullup from PFN1 to BAT, short 2 I C Serial Interface PFN1 to GND for three seconds, then release the short. 2 9) To enable Buck1, use the I C controller to set Buck1En 1:0 = 01. Quick Start 10) Write the values 0x04 to register 0x0F, 0x90 to register Required Equipment 0x10, 0x16 to register 0x11, and 0x01 to register 0x12. GPIO controller device 11) Write the value 0x35 to register 0x17. 12) Measure BK1OUT (J3 pin 6) and confirm it is 1.2V. Adjustable power supply with 0V to 5V capability 2 13) To enable Buck2, use the I C controller to set Digital multimeter (DMM) Buck1En 1:0 = 01. 2 I C controller device 14) Write the values 0x00 to register 0x0F, 0x94 to register 0x10, 0x26 to register 0x11, and 0x01 to register 0x12. Cables with grabber connections 15) Write the value 0x3A to register 0x17. Optional Equipment 16) Measure BK2OUT (J3 pin 5) and confirm it is 1.8V. Second power supply for LDOs and load switches 17) To configure the other switching regulators and LDOs, refer to the MAX20353 IC data sheet for Electronic load information regarding the AP interface. Use the 10k resistor optional second power supply as the input to LDOs and switches. Procedure 18) The EV kit is ready for additional evaluation. The EV kit is fully assembled and tested. Follow the steps below to verify basic board operation: Detailed Description of Hardware Caution: Do not enable the power supply or external The MAX20353 EV kit evaluates the MAX20353 wear- able charge-management solution. The default settings devices until all connections are made. of the EV kit differ from other versions of the IC to allow for flexible evaluation. Refer to Tables 1 through Table 3 Ordering Information appears at end of data sheet. for descriptions of the default settings and the readback values of the direct registers and AP registers on reset. 319-100506 Rev 0 2/20MAX20353 Evaluation Kit Evaluates: MAX20353 Table 1. Register Bit Default Values DEFAULT VALUE DEFAULT VALUE REGISTER BITS REGISTER BITS MAX20353A MAX20353A PFN2PUD CFG* Hi-Z Buck2En Disabled PFN1PUD CFG* PU/PD Connected Buck1En Enabled WriteProtect Disabled LDO1Md LDO ILimBlank Disabled LDO1En Disabled ILimCntl 500mA LDO2Md LDO MtChgTmr 0min LDO2En Disabled FChgTmr 600min PassDiscEna*** Enabled PChgTmr 30min LDO2VSet 3.2V TShdnTmo 10s StayOn Enabled ChgAutoRe Auto-Restart SFOUTVSet 3.3V VPChg 3.15V LDO1VSet 1.2V IPChg 10% IFCHG SysMinVlt 3.6V ChgDone 10% IFCHG SFOUTEn CHGIN ChgEn Disabled CPVSet 6.6V ChgAutoStp Enabled CPEn Disabled BatReChg 200mV CPSeq CPEn After 100% BatReg 4.35V PwrRstCfg 0b0110 ColdLim 1397.65mV Buck2Seq Buck2En After 100% HotLim 529.41mV Buck1Seq Buck1En After 100% BstISet 425mA BBstEn Disabled BstIAdptEn Enabled LDO2Seq LDO2En After 100% BstFastStrt 50ms LDO1Seq LDO1En After 100% BstFetScale Disabled ThmEn Disabled BstVSet 20V BBstVset 5V Buck1FetScale Disabled BBstISet 100mA Buck2FetScale Disabled BatOcThr 1000mA BstSeq BstEn After 100% BBstRipRed Lower Ripple BstEn Disabled BBstInd 4.7H Buck1VSet 1.8V BBstSeq BBstEn After 100% Buck1IZCSet 30mA EmfEn Disabled Buck2VSet 0.9V HptSel ERM Buck2IZCSet 10mA AlcMod Enabled Buck2ISet 150mA HptSysUVLO 3V Buck1ISet 150mA HptDrvTmo 10s BootDly** 120ms ILimMax**** 1000mA Buck2SftStrt 50ms Soft-Start T 100C CHGIN SHDN Buck1SftStrt 50ms Soft-Start Maxim Integrated 2 www.maximintegrated.com