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NX2A4WP_SDS Datasheet(PDF) 8 Page - NXP Semiconductors

Part # NX2A4WP_SDS
Description  A4WP compliant high frequency wireless charging receiver A4WP compliant high frequency wireless charging receiver
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

NX2A4WP_SDS Datasheet(HTML) 8 Page - NXP Semiconductors

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NX2A4WP_SDS
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2015. All rights reserved.
Product short data sheet
Rev. 3 — 4 August 2015
8 of 44
NXP Semiconductors
NX2A4WP
High frequency wireless charging receiver front end
7.1.2 Automatic over-voltage protection
Sudden jumps in the voltage or energy transmitted to a receiver can occur when other
receivers are switched in and out of the common radiation field of a single transmitter.
There are two alternative mechanisms available for over-voltage protection of the
AC-input pins (AC1 and AC2). The automatic frequency over-power protection method is
described above in Section 7.1.1, and the other option, the AC-clamp, is described in this
section. For details see Figure 3, Figure 6 and Figure 7.
The automatic over-voltage protection shorts both AC-input pins directly to ground when
the rectifier output voltage (VO(rect)) exceeds the over-voltage protection limit (Vovp(en)).
When the over-voltage takes place, the energy stays in the resonator circuit. In this way,
the rectifier voltage stops from rising any further. When the rectifier voltage drops below
the over-voltage protection limit (Vovp(dis)) the shorts are removed and the rectifier returns
to normal operation.
Fig 6.
Flow diagram of automatic over-power protection
RESET
OVD = ‘0’
OVDIE = ‘0’
GPIO1 = ‘1’
GPIO2 = ‘1’
VO(rect) > Vovd(en)
GPIO1 = ‘0’
GPIO2 = ‘0’
OVD = ‘1’
N
N
N
Y
Y
Positive Edge
GPIO1 = ‘1’
GPIO2 = ‘1’
Y
VO(rect) < Vovd(dis)
aaa-018657
OVD = over-power protection flag bit
(ASYN SET TO ‘1’)
OVDIE = interrupt enable bit
GPIO1 = GPIO1 OPEN-DRAIN PIN
GPIO2 = GPIO2 OPEN-DRAIN PIN
VO(rect) = voltage on pin LDRECT


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