Using The Software; Iled And Hpled Current Programming - Analog Devices EVAL-ADP1653EB Manual

EVAL-ADP1653EB

USING THE SOFTWARE

1
1. HISTORY.

2. ILED AND HPLED CURRENT PROGRAMMING.

3. SOFTWARE STROBE FOR FLASHING.
4. CLOCK AND TIME OUT DURATION PROGRAMMING.
Before running the software, ensure that the board is plugged
into the computer USB port (the USB-OK LED on the
motherboard should light up).
1. Click START > All Programs > Analog Devices > ADP165x
Evaluation Software0_5 > ADP1653 Rev E.exe. The software
detects the presence of the board's USB interface and sends the
following message: I2C OK.
2. Click OK to continue.
ILED AND HPLED CURRENT PROGRAMMING
To program the ILED current, slide the ILED Current scroll
bar to the desired setting and click UPDATE!. For the HPLED
current, enter the values of the TxMask voltage and the SETF
resistors (R4 and R5), and then click Update TxMask and SETF
Resistors. The default values are TxMask Voltage = 0 (GND), R4 =
332 kΩ, and R5 = 105 kΩ. As you change the values of the
TxMask voltage and the SETF resistors, the HPLED current
values shown adjust accordingly. Note that changing the values
4
7
5. FAULT DETECTION STATUS.
6. AUTO RANGE FINDER.
7. REGISTER VALUES.
Figure 11. Evaluation Board Software
of the resistors and the TxMask voltage in the software does not
change the actual current of the LEDs. To change the actual
current, replace the physical resistors or change the TxMask voltage
on the board. The Update TxMask and SETF Resistors button
merely calculates the current levels that correspond to the values
of the resistors and the TxMask voltage entered in the text
boxes.
For the given values of the R4, R5, and TxMask voltage, the
HPLED current is
where I
the HPLED register setting, ranging from 0 to 31.
Rev. A | Page 6 of 20
2
5
−
1 2 . V V
1.2 V
= +
TxMask
I
REF
R5 R4
= + ×
I ( 35 mA Code 15
HPLED
is the reference current at the SETF pin, and Code is
REF
3
6
×
50 kΩ I
×
REF
mA )
1 2 . V