MAX77301EVKIT datasheet(3/15 Pages) MAXIM

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Evaluates: MAX77301

MAX77301 Evaluation Kit

If simulating a battery, set the BAT electronic load to

3.6V at CV mode and turn off.

Observe correct polarity. Connect the BAT electronic

load/Li+ battery and series digital multimeter (DMM4)

in the current-measurement mode, as shown in Figure

9. Leave the BAT electronic load turned off. If using an

Li+ battery, leave the positive terminal unconnected.

10) Connect DMM1 across the BAT electronic load/Li+

battery. Connect the positive terminal of DMM1 to

the positive terminal of the Li+ battery. Connect the

negative terminal of DMM1 to the negative terminal

of the Li+ battery.

11) Connect DMM2 from INT_3V3 to BUS_DGND.

12) Connect DMM3 from SYS to SYS_DGND.

13) Preset the SYS electronic load for 100mA and turn off.

14) Connect the SYS electronic load from SYS to

SYS_GND.

15) Plug a USB cable from P1 to the PC with a 500mA

USB cable.

16) Verify that the LED at D1 is on, indicating that a

dedicated charger has been detected.

17) Start the EV kit software.

18) Select the

Device menu item in the upper-left corner,

then

Connect. Wait for the device to respond, and in

the

Synchronize window, press the Read and Close

button. Normal device operation is verified when

Connected is displayed in bottom-left corner.

Note: All default EV kit software settings are used

for the remainder of the test procedure.

19) Turn on the BAT electronic load or connect the posi-

tive terminal of the Li+ battery to VBAT+.

Note: When using an Li+ battery, if VBAT+ < 2.5V,

the charger starts up in precharge mode. If VBAT+

≥ 2.5V, the charger starts up in fast-charge mode.

If in precharge mode, verify that DMM4 reads 50mA. If

in fast-charge mode, verify that DMM4 reads 200mA.

20) Verify that CHG_STAT (the LED at D4) is on, indicat-

ing that charging is occurring.

21) Verify that the voltage read by DMM2 is approxi-

mately 3.3V.

22) Verify that the voltage read by DMM3 is (DMM1 +

140mV) or 4.3V, whichever is greater.

23) Turn on the SYS electronic load and verify that the

voltage read by DMM3 is (DMM1 + 140mV) or 4.3V,

whichever is greater.

24) Disconnect the BAT electronic load/Li+ battery

and wait until DMM1 reads 4.2V, indicating a fully

charged battery.

25) Verify that the voltage read by DMM3 is the greater

of (DMM1 + 140mV) or 4.35V.

26) Turn off the SYS electronic load.

27) Remove the USB cable from P1.

28) Disconnect all test leads from the EV kit.

Detailed Description of Hardware

The MAX77301 EV kit evaluates the MAX77301 inte-

grated 1-cell Li+ charger with USB enumeration and

adapter-type detection capability. The EV kit negotiates

charging current from the USB host or hub, without pro-

cessor intervention. The IC also automatically detects for

a dedicated charger, USB charger, or adapter and sets

the input-current limit accordingly. The USB input power

not used by the system charges the battery.

USB Interface

An integrated USB peripheral controller provides

autoenumeration for full-speed and low-speed modes.

The USB controller is in charge of:

● Executing adapter-detection sequence: Detects

what type of adapter is externally connected to the

USB receptacle (P1) and sets the input-current limit

accordingly.

If the USB receptacle (P1) is attached to a USB charger

(host or hub) or a USB 2.0 (host or hub), it enumerates

as an HID device and negotiates the maximum charging

current level (from BUS).

The IC operates in low-speed mode using an internal

6MHz oscillator and does not require an external crystal

to be USB compliant. The IC operates in full-speed mode

and requires an external 12MHz crystal (Y1, Figure 9).

According to the USB 2.0 specification, a low-speed

device is not allowed to use a standard USB type-B

connector, which is why the IC is also able to operate in

full-speed mode. This makes it possible to use a custom or

captive cable for low-speed mode using the IC and still be

USB compliant. While operating in full-speed mode, using

the IC allows use of a standard USB type-B connector.

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