NCP2824FCT2GEVB
http://onsemi.com
3
OPERATION
The operating power supply of the NCP2824 is from 2.5
to 5.5 V. The absolute maximum input voltage is 7.0 V. A
power supply set to 3.6 V and current limit set to at least
1.5 A must be connected to J14 connector to powering the
NCP2824EVB/D. Also to compensate for parasitic
inductance of wires between the power supply and the
evaluation board it is highly recommended to connect a
470 mF electrolytic capacitor to bypass J14 terminal. Like
this the device can be evaluated under powering condition
very similar that battery power supplies.
Performances of EVB Solution
To be as close as possible with final handset application,
the design of this power conversion solution used small size
footprints where possible. Changing components may
positively or negatively impact the evaluation board
performance illustrated in Figure 3 to 8. For more
information please refer to the NCP2824 datasheet.
Single Wire Interface Operation
The single wire interface allows changing the default
configuration of the NCP2824.
After Wake up, the NCP2824 is configured with:
•
AGC enable
•
Non Clip + Power limit
•
Gain = 18 dB
•
THD max = 1%
The following table described all the NCP2824
configurations.
Table 1. NCP2824 CONFIGURATION
Pulse
Counting
Register
Description
01
AGC
AGC disable
02
AGC Enable
03
Reset
Reset configuration
04
Gain
Control
Gain = 12 dB
05
Gain = 18 dB
06
THD
Control
1%
07
2%
08
4%
09
6%
10
8%
11
10%
12
15%
13
20%
14
NC+L
Non Clip + Power limit
15
NC
Non Clip only
16
Power
Limit
Control
0.45 V
Peak
17
0.9 V
Peak
18
1.35 V
Peak
19
1.8 V
Peak
20
2.25 V
Peak
21
2.7 V
Peak
22
3.15 V
Peak
23
3.6 V
Peak
Single Wire commands can easily be emulated using a
pulse generator configured in accordance with the Single
wire specification, for more information about timings
please refers to NCP2824 datasheet.
