ISO1540-Q1 Texas instruments

ISO1540-Q1

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ISO1540-Q1

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Описание

The ISO1540-Q1 and ISO1541-Q1 devices are low-power, bidirectional isolators that are compatible with I2C interfaces. These devices have logic input and output buffers that are separated by Texas Instruments Capacitive Isolation technology using a silicon dioxide (SiO2) barrier. When used with isolated power supplies, these devices block high voltages, isolate grounds, and prevent noise currents from entering the local ground and interfering with or damaging sensitive circuitry.This isolation technology provides for function, performance, size, and power consumption advantages when compared to optocouplers. The ISO1540-Q1 and ISO1541-Q1 devices enable a complete isolated I2C interface to be implemented within a small form factor.The ISO1540-Q1 has two isolated bidirectional channels for clock and data lines while the ISO1541-Q1 has a bidirectional data and a unidirectional clock channel. The ISO1541-Q1 is useful in applications that have a single controller while the ISO1540-Q1 is suitable for multi-controller applications. For applications where clock stretching by the target is possible, the ISO1540-Q1 device should be used.Isolated bidirectional communication is accomplished within these devices by offsetting the low-level output voltage on side 1 to a value greater than the high-level input voltage on side 1, thus preventing an internal logic latch that otherwise would occur with standard digital isolators.

Qualified for automotive applications
AEC-Q100 qualified with the following results:
- Device temperature grade 1: –40°C to +125°C ambient operating temperature
- Device HBM ESD classification level 3A
- Device CDM ESD classification level C6
Functional Safety-Capable
- Documentation available to aid functional safety system design: ISO1540-Q1, ISO1541-Q1
Isolated bidirectional, I²C compatible, communication
Supports up to 1-MHz operation
3-V to 5.5-V supply range
Open-drain outputs With 3.5-mA Side 1 and 35-mA Side 2 sink current capability
±50-kV/µs transient immunity (Typical)
Safety-related certifications:
- 4242-V_PK isolation per DIN EN IEC 60747-17 (VDE 0884-17)
- 2500-V_RMS isolation for 1 minute per UL 1577
- CSA approval per IEC 62368-1 end equipment standard
- CQC basic insulation per GB4943.1-2011

Features	Buffer, Isolated
Frequency (max) (MHz)	1
VCCA (min) (V)	3
VCCA (max) (V)	5.5
VCCB (min) (V)	3
Supply restrictions	No rule
Rating	Automotive
TI functional safety category	Functional Safety-Capable
Operating temperature range (°C)	-40 to 125