T5577 125 kHz RFID card: specs
Passive low-frequency RFID card with a rewritable chip. Data sheet used: Microchip (Atmel) ATA5577C, which is compatible with the T5557 and ATA5567. The card needs a writer to change its contents.
Specs
| Spec | Value | Source |
|---|---|---|
| RF frequency | 100 kHz to 150 kHz (125 kHz and 134 kHz applications) | source Features (p.1); Section 1 Introduction |
| Memory | 363 bits EEPROM: 11 blocks of 32 bits plus 1 lock bit each | source Features (p.1) |
| User memory | 7 blocks of 32 bits including the 32-bit password block; 2 blocks hold the unique ID | source Features (p.1) |
| Coding options | Manchester, bi-phase, FSK, PSK, NRZ; data rate RF/2 to RF/128 | source Features (p.1) |
| Modes | Basic Mode or Extended Mode; password mode; answer-on-request mode | source Features (p.1) |
| Write protection | One lock bit per block; once locked the block cannot be written again | source Section 4 Functional Blocks, memory description |
| Operating ambient temperature | -40 C to +85 C | source Section 8 Absolute Maximum Ratings |
| Write endurance | 100000 cycles (erase all / write all) | source Section 9 Electrical Characteristics, item 9 |
| Maximum coil current | 20 mA DC or AC peak at 125 kHz | source Section 8 Absolute Maximum Ratings |
Power
| Value | Source | |
|---|---|---|
| Supply | Passive card, powered through its coil by the reader at 100-150 kHz | source Section 9 Electrical Characteristics, item 2.2 |
| Current | Read: 2 uA typical, 5 uA max (chip supply current, full temperature range) | source Section 9 Electrical Characteristics, item 2.2 |
Pinout
We don't publish a pin table for this part: no official source we could verify gives one. Check the labels printed on your module, and see the notes below.
A card has no header or pins. The sheet is the ATA5577C chip; which of T5557, T5567 or T5577 is on the supplied cards is not documented by a maker source.
Build with it
Project ideas for the T5577 125 kHz RFID card. Each link opens Soldr with the prompt filled in; Soldr assigns the pins, checks power and shows how to wire every part.
- Card read demo on a Raspberry Pi: Needs a 125 kHz reader, which is the JT308 here. The card must first be written by a 125 kHz writer you already own so it sends an ID the reader understands.
- Visitor sign-in table with notice: If it records who signs in, display a notice and get agreement. Cards are blank until written with a writer you already own.
- Timed card tap clock: Learning project. Only use cards you own and tell anyone whose taps are recorded.
Common mistakes
- Locking a block by accident: the lock bit is permanent for that block (source)
- Using a 13.56 MHz reader such as the MFRC522: this chip works at 100-150 kHz only (source)
- Setting password mode and losing the password: in password mode the first 32 bits after the opcode are taken as the password (source)
Not covered by the official source
- Which chip (T5557, T5567 or T5577) is in the supplied cards is not documented by a maker source.
- The reader's output format is not covered here; check the reader's own page.
Sources
- link (Microchip/Atmel 9187H-RFID-07/14, ATA5577C Read/Write LF RFID IDIC 100 to 150 kHz)