SI840XI2C-KIT Silicon Laboratories Inc, SI840XI2C-KIT Datasheet - Page 13

• Manufacturer Part Number: SI840XI2C-KIT
• Description: KIT EVAL FOR SI840X
• Manufacturer: Silicon Laboratories Inc

Specifications of SI840XI2C-KIT

• Main Purpose: Interface, Digital Isolator
• Embedded: No
• Utilized Ic / Part: Si8400, Si8401, Si8405
• Primary Attributes: Assorted Bi-directional i²C Isolators
• Secondary Attributes: 2 Single Channel, 1 Dual channel isolator
• Interface Type: I2C
• Operating Supply Voltage: 2.7 V to 5.5 V
• Product: Interface Modules
• For Use With/related Products: Si840x
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 336-1990

3. Device Operation
Device behavior during start-up, normal operation, and shutdown is shown in Figure 7, where UVLO+ and UVLO-
are the positive-going and negative-going thresholds respectively. Refer to Table 12 to determine outputs when
power supply (VDD) is not present.
3.1. Device Startup
Outputs are held low during powerup until VDD is above the UVLO threshold for time period tSTART. Following
this, the outputs follow the states of inputs.
3.2. Under Voltage Lockout
Under Voltage Lockout (UVLO) is provided to prevent erroneous operation during device startup and shutdown or
when VDD is below its specified operating circuits range. Both Side A and Side B each have their own under
voltage lockout monitors. Each side can enter or exit UVLO independently. For example, Side A unconditionally
enters UVLO when AVDD falls below AVDD
operates the same as Side A with respect to its BVDD supply.
BVDD
INPUT
OUTPUT
AVDD
UVLO+
UVLO-
UVLO+
UVLO-
tSTART
tSD
Figure 7. Device Behavior during Normal Operation
tSTART
UVLO–
and exits UVLO when AVDD rises above AVDD
tSTART
Rev. 1.3
tPHL
tPLH
Si840x
UVLO+
. Side B
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