MAX77301 datasheet(21/67 Pages) MAXIM

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Pin Description (continued)

NAME

FUNCTION

CHG_STAT

Charge Status Output. Logic-low open drain output indicating battery charging. When a

temperature fault is detected, the output is pulsed at 50% duty cycle with a period of 1.5s. When a

charge timer fault is detected CHG_STAT is pulsed at 50% duty cycle with a period of 0.15s. When

no battery is connected, CHG_STAT is pulsed at a 0.1s period and 10%–20% duty cycle. Connect

this pin to ground if not used.

D+

USB D+ Signal. Connect a 33Ω resistor between D+ a USB connector to add signal integrity.

IRQ

Interrupt Request. Logic-low open-drain output that indicates when an interrupt has occurred.

THM

Thermistor Input. Battery temperature detect input. Connect a negative temperature coefficient

(NTC) thermistor close to the battery pack. Connect the other thermistor lead to AGND. Connect a

pullup resistor from THM to INT_3V3 (47kΩ pullup resistor is recommended with a 100kΩ

thermistor). Connect to AGND to disable this feature. Note the thermistor and pullup resistor are

required for battery NTC detection mode.

INT_3V3

3.3V Logic Supply Output. Connect a 1μF capacitor from INT_3V3 to AGND. The output is rated

for up to a 10mA load. The INT_3V3 output is active whenever a valid voltage is present on BUS_

pins.

DGND

Digital Ground. Connect DGND to power ground, including input capacitor, system capacitor, and

battery capacitor ground nodes.

D-

USB D- Signal. Connect a 33Ω resistor between D- a USB connector.

MAX77301/MAX77301A

JEITA-Compliant, Li+ Charger with Smart Power

Selector, Automatic Detection, and USB

Enumeration

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MAX77301 Datasheet(PDF) 21 Page - Maxim Integrated Products