ACR1255U-J1 has two interfaces: Bluetooth (also known as Bluetooth Low Energy or BLE) for pairing with mobile devices, and USB Full Speed for PC-linked operation. Additionally, it can read/write at a speed of up to 424 Kbps for contactless smart card and NFC device access. If you know more about the NXP PN53X chip, please reply here or drop me a note in my email. I've been searching high and low for some datasheets on the PN531 but to no avail. NXP are keeping them under wraps.
The LED is placed in the discharge path of capacitor C1.Capacitor C1 charges through D1 and R1 and discharges through the LED and R2. Power consumoption depends on the values of R1 and C1. With higher values LED shows low brightness but power consumption will be less. Low current Flasher Schematics then click the following link, to be taken to the MPJA website. http://www.mpja.com
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