Faqs - Analog Devices EVAL-ADP1653EB Manual

FAQS

Why does the solution size seem bigger than was expected?
This board (4.0.1) is intended as an evaluation board, with easy
access to test points and current measurements and the ability
to switch components easily. The LFCSP and all other pads are
extended so that parts can be exchanged and hand-soldered
easily. The 0 Ω resistor between the diode and the LEDs can be
replaced with either a current-sensing resistor to measure
current or a larger resistor to simulate a system with a larger
HPLED V .
F
The evaluation kit includes a 9 mm × 9 mm reference (including
the two LEDs), but several alternative reference designs are
available.
Why is the logic level of INTF equal to VBAT/2, whereas all
others are 1.8 V?
It is not envisaged that customers will change between HW and I
modes during operation; therefore, 1.8 V logic levels are not
necessary on this pin.
Can I use an ammeter to measure HPLED currents?
Yes, but it is not recommended due to the internal resistance of
the ammeter. It can be used in the torch mode. However,
measuring the battery current with an ammeter causes the part
to hit undervoltage lockout (UVLO) at a lower battery voltage
due to the IR drop. If an ammeter is used, ensure that its range
is not set to auto, because the resistance can change during the
measurement and result in a perturbation of the control loop.
Rev. A | Page 17 of 20
EVAL-ADP1653EB
2
C