Click here for production status of specific part numbers. Evaluates: MAX20345 MAX20345 Evaluation Kit 2 2) Connect the I C controller device to GND (J5 pins 1 General Description and 12, J6 pins 1 and 12), SDA (J6 pin 6), and SCL The MAX20345 evaluation kit (EV kit) is a fully assembled (J6 pin 7). and tested circuit for evaluating the MAX20345 wearable 3) Set the power supply voltage to 3.7V and turn off the 2 charge-management solution with I C compatibility for supply. low-power wearable applications. The device includes a 4) Connect the positive terminal of the 3.7V to V BAT linear battery charger, smart power selector, three ultra- and the negative terminal to GND. low quiescent current buck regulators, a buck-boost regu- 5) Turn on the 3.7V power supply. lator, three low-dropout (LDO) linear regulators, two load 2 6) Turn on the GPIO controller device and the I C con- switches, and five GPIO pins. troller device. Refer to the full MAX20345 IC datasheet for detailed 7) Set the GPIO controller output high to enable the information regarding the operation and features of the MAX20345. devices. 8) Measure the voltage on SYS (J1 pin 1 and J6 pin 3) and confirm it equals V . If the SYS voltage is BAT Benefits and Features less than 2.7V, set the GPIO controller low for three RoHS Compliant seconds, then set it back to high. Optional: If using a 10k pullup from PFN1 to BAT, Proven PCB Layout short PFN1 to GND for three seconds, then release Fully Assembled and Tested the short. 2 I C Serial Interface 2 9) To enable Buck1, use the I C controller to set Buck1En 1:0 = 01 by writing the value 0xE9 to regis- Quick Start ter 0x16. Measure the voltage of BK1OUT (J4 pin 1) and confirm that it is 0.7V Required Equipment 2 10) To enable Buck2, use the I C controller to set Buck- GPIO Controller Device 2En 1:0 = 01 by writing the value 0xEB to register Adjustable Power Supply with 0V to 5V Capability 0x1F. Measure the voltage of BK2OUT (J4 pin 2) and Digital Multimeter (DMM) confirm that it is 1.2V 2 2 11) To enable Buck3, use the I C controller to set I C Controller Device Buck3En 1:0 = 01 by writing the value 0xED to reg- Cables with Grabber Connections ister 0x28. Measure the voltage of BK3OUT (J4 pin 3) and confirm that it is 1.8V Optional Equipment 12) If testing LDOs and load switches, set the second Second Power Supply for LDOs and Load Switches power supply voltage to the desired LDO or load Electronic Load switch input voltage. Turn off the power supply, connect the positive terminal to the LDO or load 10k Resistor switch input, connect the negative terminal to GND, Procedure then turn on the power supply. Measure the LDO or The EV kit is fully assembled and tested. Follow the steps load switch output and confirm that it matches the below to verify basic board operation: expected value setting. 13) To test the performance of regulators under a load, Caution: Do not enable the power supply or external connect the electronic load to the regulator output pin. devices until all connections are made. 14) The EV kit is ready for additional evaluation. 1) Connect the GPIO controller device to PFN1 (J6 pin 11). Set the output to low. Optional: If a GPIO controller is unavailable, connect a 10k pullup resistor from PFN1 to BAT (J5 pin 4). Ordering Information appears at end of data sheet. 319-100267 Rev 3 8/19Evaluates: MAX20345 MAX20345 Evaluation Kit J2 contains a path to a user supplied IO voltage V at IO Detailed Description of Hardware pin 1 and a path to GND at pin 6. A through-hole four- The MAX20345 EV kit evaluates the MAX20345 wear- resistor network can be placed in J2 with the reference able charge-management solution. The default settings of pin at either pin 1 or pin 6 of J2. This attaches the pullup the EV kit differ from other versions of the IC to allow for or pulldown resistors on INT, RST, SDA, and SCL. V is IO flexible evaluation. Refer to Tables 1-3 for descriptions of supplied through pin 2 of connector J1. the default settings and the readback values of the direct See Table 3 through Table 8 for pin descriptions of the registers and AP registers on reset. connectors J1-J6. Optional Pullup Resistors The EV kit includes space to install a resistor network to conveniently pull certain pins up or down. Connector Table 1. Register Bit Default Values REGISTER BITS MAX20345 EVKIT REGISTER BITS MAX20345 EVKIT SysMinVlt 4.0V Buck1FETScale Disabled ILimBlank Disabled Buck2ISet 150mA ILimCntl 450mA Buck3VSet 1.80V IChgDone 30% I Buck3En Disabled FCHG BatReChg BatReg - 70mV Buck3IZCSet 30mA BatReg 4.20V Buck2SftStrt 100ms Soft-Start ChgEn Enabled Buck2FETScale Disabled PChgTmr 240min Buck3ISet 150mA VPChg 3.15V BBstVSet 5.00V IPChg 5% I BBstEn Disabled FCHG ChgStepRise 3.80V BBstMode Buck-Boost ChgAutoStp Enabled Buck3SftStrt 100ms Soft-Start ChgAutoReSta Enabled Buck3FETScale Disabled MtChgTmr 60min BBstIPSet2 BBstIPSet1 + 100mA FChgTmr 600min BBstIPSet1 150mA ChgIStep 50% I LDO1Mode LDO FCHG ChgStepHyst 400mV BBstFETScale Disabled Buck1VSet 0.70V LDO2Mode Load Switch Buck1En Disabled LDO1VSet 1.8V Buck1IZCSet 10mA LDO1En Disabled ThmEn Charge in T1-T3 LDO3Mode LDO Buck1ISet 150mA LDO2VSet 1.8V Buck2VSet 1.200V LDO2En Disabled Buck2En Disabled LDO3VSet 0.7V Buck2IZCSet 20mA LDO3En Disabled Buck1SftStrt 100ms Soft-Start BootDly 120ms