ISO1540DR IS1540 I2C Interface-compatible Low-Power Bidirectional Isolator
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ISO1540DR I2C Bidirectional Digital Isolator for ASIC Hashboards
The ISO1540DR is a low-power bidirectional digital isolator with I2C-compatible logic inputs and open-drain outputs, designed to galvanically isolate the I2C bus that links a control board to ASIC hashboards. It is the part of choice when a hashboard PMIC controller, EEPROM or temperature sensor needs to sit in a different ground domain from the supervising MCU.
Capable of operating up to 1MHz across a 3V to 5.5V supply range, the ISO1540 also delivers ±50kV/µs transient immunity and 4kV HBM ESD protection (8kV on bus pins) — useful in noisy mining racks where ground loops can otherwise corrupt I2C traffic.
Specifications
| Parameter | Value |
|---|---|
| Part number | ISO1540DR (IS1540) |
| Condition | New |
| Function | Low-power bidirectional I2C-compatible digital isolator |
| Supply range | 3V to 5.5V |
| Data rate | Up to 1MHz |
| Output type | Open-drain |
| Sink current | 3.5mA side 1 / 35mA side 2 |
| Operating temperature | -40°C to +125°C |
| Transient immunity | ±50kV/µs typical |
| ESD protection | 4kV HBM (all pins), 8kV on bus pins |
| Application | Isolated I2C bus between ASIC hashboard and control board |
Where the ISO1540 sits on a hashboard
On most modern ASIC mining boards, the I2C bus carries identification, temperature and power-management data between the control board and each hashboard. The ISO1540 sits on the control-board side of that link, isolating the supervising MCU from the high-current, high-noise hashboard domain. When it fails, hashboards appear missing, temperature reads as 0/255, or the controller throws repeated I2C bus errors.
Compatibility
Drop-in for ISO1540DR / IS1540 sockets on ASIC mining hashboards and control boards. The 1MHz data rate is ample headroom for the typical 100kHz-400kHz I2C traffic on Antminer, Whatsminer and Avalon boards. Confirm pin-out before swapping if your board uses a different isolator family in the same footprint.
Common failure symptoms
- Hashboard not detected by the control board (no temperature, no chain info)
- Persistent I2C bus errors in the miner log
- Temperature reading stuck at 0°C or maximum value
- Isolator IC running hot or visibly damaged
- Bus pulled low permanently on the isolated side
Frequently asked questions
Is the ISO1540 bidirectional on both SDA and SCL?
It is bidirectional on the data side (SDA) as required by I2C. SCL is unidirectional, driven from the master side.
Does it support standard 3.3V to 5V level shifting?
Yes — each side can run independently between 3V and 5.5V, so it doubles as a level shifter when needed.
What is the typical data rate on a miner?
Most ASIC miners use 100kHz or 400kHz on the hashboard I2C bus, well within the 1MHz rated capability of the ISO1540.
Do you stock matching PMICs and temperature sensors?
Yes — we carry SY7302ABC PMICs and related hashboard ICs that frequently share the same I2C bus.
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Contact contact@lys-sz.com for volume pricing or compatibility questions.
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