MAX77650 datasheet(11/27 Pages) MAXIM

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Evaluates: MAX77650/MAX77651

MAX77650/MAX77651 Evaluation Kit

Charger Quick Start

The

Charger tab on the GUI has many settings to toggle;

however, only three registers are needed to charge a bat-

tery. To get started with the charger, follow the procedure

below:

1) Determine the capacity of the battery to identify a safe

charge current. Maxim recommends charging at 70%

of the total capacity (e.g., a 40mAh battery can be

charged at 30mA charge current). Consult the battery

manufacturer’s data sheet carefully to determine safe

charging parameters.

2) In Charger Configuration E/F, move the

Fast-Charge

Current (IFAST_CHG) slider to the desired charge

current setting, and click the

Write button.

3) In Charger Configuration G/H/I, move the

Fast-

Charge Voltage (VFAST_CHG) slider to the desired

charge voltage setting, and click the

Write button.

4) Make sure there is a charge source connected to the

EV kit at 5V. Then, enable the charger by setting the

button labeled

Charger to ‘1’ (Enabled) and click the

Write button.

5) The battery should now be charging at the charge

current set from step 2.

For more information on the capabilities of the battery

charger, refer to the IC data sheet and Programmer’s

Guide.

LED Quick Start

There is an RGB LED cluster on the EV kit, and three cur-

rent sinks (LED0, LED1, and LED2). To get started with

the EV kit LEDs, follow the procedure below:

1) Choose an LED Configuration section to change.

LED0 controls Blue, LED1 controls Red, and LED2

controls Green.

2) The main-bias circuits must be on for the current sinks

to enable. This can be accomplished by: pressing the

on-key (SW1), or in the

Global Resources tab of the

GUI, setting the

Main Bias Enable Controller bit to

a ‘1’ and click the

Write button. Pressing the on-key

will allow the internal on/off controller to enable the

main-bias, while setting the GUI bit to ‘1’ will force the

main-bias circuits on.

3) On the

LED Driver tab of the GUI, set the desired

LED Full Scale to 3.2mA.

4) Set the Duty Cycle and Period to a desired blinking

configuration (100% duty cycle for always-on).

5) Set the Brightness to 50% or adjust as needed. Click

the

Write button.

6) Set the

LED Master Enable bit in LED TOP Configu-

ration to ‘1’. Click the

Write button. The LEDs should

now be powered. If they are not, see step 2 of this

procedure.

7) Adjust the settings for the other LEDs as desired.

MAX77650/MAX77651 EV Kit Differences

The MAX77650 and the MAX77651 are the same in

every way except for the output voltage range of two of

the SIMO outputs. The MAX77650 SBB1 output voltage

range is from 0.8V to 1.5875V, whereas the MAX77651

SBB1 output voltage range is from 2.4V to 5.25V. The

MAX77650 SBB2 output voltage range is from 0.8V to

3.95V, whereas the MAX77651 SBB2 output voltage

range is from 2.4V to 5.25V. To expedite evaluation of

these two products, Maxim offers the MAX77650EVKIT#

and the MAX77651EVKIT#.

Like the devices themselves, these two EV kits are almost

identical. The PCB layout and schematic are identical for

both EV kits. The silkscreen designator for the part num-

ber on the PCB is different as well as the actual device

(U1). As shown in the MAX77650/MAX77651 EV Kit

Component List, R227, R234, R246, and R247 are differ-

ent for each EV kit. On the MAX77651 EV kit, these resis-

tors scale the SBB1/SBB2 output voltages to be within the

4.096V full-scale range of the MAX11614 ADC. They also

create a 1MΩ impedance path to ground, which creates

additional current. To see the true quiescent current of the

device, remove J203 and J205 from the EV kit.

The GUI automatically detects the device version by

reading the DIDM bit. The transfer function for converting

the SBB1 and SBB2 voltages are adjusted based on the

version detected.

Note that the photos and layout files shown are for the

MAX77650, but are directly applicable to the MAX77651.

#Denotes RoHS compliant.

Ordering Information

PART

TYPE

MAX77650EVKIT#

MAX77650AEWV+

EV Kit

MAX77651EVKIT#

MAX77651AEWV+

EV Kit

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