MAX20335EVKIT# Analog Devices

Click here for production status of specific part numbers. MAX20335 Evaluation Kit Evaluates: MAX20335 2 2) Connect the I C Controller device to GND, SDA (J1 General Description pin 6) and SCL (J1 pin 7). The MAX20335 evaluation kit (EV kit) is a fully assembled 3) Set the power supply voltage to 3.7V and turn off the and tested circuit for evaluating the MAX20335 wear- supply. 2 able charge-management solution with I C capability for 4) Connect the positive terminal of the 3.7V power low-power wearable application. The device includes a supply to BAT (J1 pin 4) and the negative terminal to linear battery charger, smart power selector, two ultra-low GND (J3 pin 1 ). quiescent current buck regulators, and three low-dropout 5) Turn on the 3.7V power supply. (LDO) linear regulators. 6) Turn on the GPIO controller device and I2C control- Refer to the MAX20335 IC data sheet for detailed informa- ler device. tion regarding the operation and features of the devices. 7) Set GPIO controller to output logic-high to PFN1 to power on the MAX20335. Features 8) Measure the voltage on SYS (J1 pin 3) and confirm RoHS Compliant that it equals the battery voltage. 2 9) To enable Buck1 output, use the I C controller to set Proven PCB Layout Buck1En 1:0 to 01 by writing value 0xE9 to reg- Full Assembled and Tested ister 0x0D. Measure B1OUT (J2 pin 6) and confirm 2 I C Serial Interface that it equals 1.2V. 2 10) To enable Buck2 output, Use the I C controller to set Buck2En 1:0 to 01 by writing value 0xE9 to regis- Quick Start ter 0x0F. Measure B2OUT (J2 pin 5) and confirm that Required Equipment it equals 1.8V. Adjustable power supply with 0V to 5V capability 11) Optional: To test any one of the LDOs, set the sec- ond power supply voltage to the desired LDO input Digital multimeter (DMM) voltage. Turn it off and then connect the positive 2 I C controller device terminal to the LDO input and the negative terminal GPIO controller device to GND. Turn it on. To enable the LDO output, use the I2C controller to write value 0xE2 to the register Cables with grabber connections LDO1Cfg, LDO2Cfg, or LDO3Cfg corresponding to Optional Equipment the LDO under test. Measure the voltage of the LDO output and confirm that it matches the default setting: Second power supply for LDOs 0.8V (LDO1), 0.9V (LDO2), and 0.9V (LDO3). Procedure 12) The EV Kit is ready for additional evaluation. The EV kit is fully assembled and tested. Follow the steps Detailed Description of Hardware below to verify basic board operation: The MAX20335 evaluation kit (EV Kit) evaluates the Caution: Do not turn on the power supply and exter- MAX20335 wearable charge-management solution. nal devices until all connections are completed. See Table 1 thru Table 3 for pin descriptions of the three 1) Connect PFN1 (J2 pin 11) to the GPIO controller out- connectors (J1J3). put. Alternatively, PFN1 can be connected to a 3V IO supply through a 10k pullup resistor. This procedure Ordering Information appears at end of data sheet. assumes that a GPIO controller is used. 319-100182 Rev 1 2/19MAX20335 Evaluation Kit Evaluates: MAX20335 Table 1. Connector J1 Table 3. Connector J3 PIN MAX20335 DESCRIPTION PIN SIGNAL DESCRIPTION 1 GND Ground 1 GND Ground 2 MON Voltage Monitor Output 2 CHRGIN Charger Input 3 N.C. Not Connected 3 SYS System Load Connection 4 INT Open-drain Active-low Interrupt Output 4 BAT Battery 5 RST Power-On Reset Output. Battery Temperature Thermistor 5 THM Connection 2 6 SDA I C Serial Data Input / Output 6 CAP Bypass for Internal LDO 2 7 SCL I C Serial Clock Input External Resistor Connection for 8 MPC1 Multipurpose Configuration Input 1 7 SET Configuring Battery Charge Current 9 MPC0 Multipurpose Configuration Input 0 8 LED LED Current Sink Input 10 PFN2 Power Function Control Input / Output 9 N.C. Not Connected 11 PFN1 Power Function Control Input 10 N.C. Not Connected 12 GND Ground 11 N.C. Not Connected 12 GND Ground Table 2. Connector J2 Component Suppliers PIN SIGNAL DESCRIPTION 1 L3IN LDO3 Input SUPPLIER WEBSITE 2 L3OUT LDO3 Output Murata Americas www.murata.com 3 L2OUT LDO2 Output TDK Corp www.component.tdk.com 4 L1OUT LDO1 Output Note: Indicate that you are using the MAX20335 when contacting these component suppliers. 5 B2OUT Buck Regulator 2 Output 6 B1OUT Buck Regulator 1 Output 7 L2IN LDO2 Input 8 L1IN LDO1 Input Maxim Integrated 2 www.maximintegrated.com