AS39513 datasheet(11/108 Pages) AMSCO

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[v1-10] 2018-Apr-25

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AS39513 − Detailed Description

The AS39513 is designed for use in smart semi-passive labels as

well as in full passive labels. Smart semi-passive labels are

defined as thin and flexible labels that contain an integrated

circuit and a power source. Semi-passive smart labels, also

known as battery-assisted back-scattered passive labels, enable

enhanced functionality and performance over passive labels.

The IC includes sensor functionality and logging of sensor data.

The RFID portion of the AS39513 operates at 13.56 MHz and is

fully ISO15693 and NFC-V (T5T) compliant. The sensor

controller runs with an independent clock of frequency fSYS. The

chip is supplied from a single-cell battery of typically 1.5V, or

from a dual cell battery of typically 3V. The on-chip temperature

sensor and real-time clock (RTC) accommodate temperature

data logging with time stamps.

Power Management

The AS39513 is supplied from either the battery or through the

power coupled from the RFID reader. The device (sensors, ADC,

real-time clock and logic) is normally supplied from the battery

unless there is no battery attached (passive label), or when the

battery is drained. When no battery power is available, these

circuits will be powered by the RFID reader. The RFID AFE is

always powered by the reader.

Note 1.5V and 3V batteries are supported but the battery supply

voltage range is not continuous. Please see electrical

characteristics. Also it is assumed the battery will be connected

when the RF field is not present. Correct operation is not

guaranteed if the battery is connected in the presence of an RF

field. A minimum ramp up time for VBAT of tRAMP is required to

ensure all system registers are correctly loaded from system

EEPROM during initialization. This is valid for both 1.5V and 3V

battery operation.

Energy Harvesting

AS39513 has harvesting capability. The regulated voltage

output pin for energy harvesting is VEXT. If an RFID reader is

present, the harvested reader power is then available externally

through the VEXT pin. An internal regulator limits the voltage

to VEXT. The output impedance RVEXT of this voltage source is

fixed.

Analog Front End (AFE)

The analog front end (AFE) operates at a carrier frequency of

13.56 MHz according to the ISO 15693 and NFC-V type 5 tag

standards. The incoming data is demodulated from the received

ASK (Amplitude Shift Keying) signal, with either 10- 30%

modulation index or 100% modulation index. Outgoing data is

transmitted from the AS39513 using load modulation and

employs Manchester coding with one or two sub-carrier

frequencies: 423.75 kHz (fc/32) or 484.28 kHz (fc/28).

Detailed Description

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