Fig 13. Battery Discharge Curve - NXP Semiconductors PN7150 Hardware Design Manual

NXP Semiconductors
Table 8. Pros and cons for each TVDD configuration
Configuration 1 - No external 5V supply
Configuration 2 - Maximize the performances in reader mode and
card mode
- Use the internal TXLDO to filter the 5V power
supply
PN7150 can operate at fixed RF field strength in Poll mode with a continuous battery
voltage down to:
The figure below shows 2 typical battery discharge cycles.

Fig 13. Battery discharge curve

AN11756
Application note
COMPANY PUBLIC
Pros
a. 3.1V when TVDD is set to 2.7V
b. 3.5V when TVDD is set to 3.1V
4,5
4
3,5
3
2,5
2
100% 90% 80% 70% 60%
Battery Charge [%]
All information provided in this document is subject to legal disclaimers.
Rev. 1.2 — 15 January 2018
347612
PN7150 Hardware Design Guide
- No performances improvement thanks to higher
VDD(TX) voltage
- Higher power consumption compare to
configuration 1
50% 40% 30% 20% 10% 0%
AN11756
Cons
Battery 1 Voltage [V]
Battery 2 Voltage [V]
RF performance drop if
TVDD <2,7V (input
<2,9V)
RF performance drop if
TVDD <3,1V (input
<3,3V)
Battery 1 @12%
charge
Battery 2 @60%
charge
Battery 1 @5% charge
© NXP B.V. 2018. All rights reserved.
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