Datasheet

ISO1540
1
2
3
4
5
6
7
8
GND2
SCL1
VCC2
VCC1
SCL2
Side 1
SDA1
SDA2
Isolation
ISO1541
1
2
3
4
5
6
7
8
GND2
SCL1
VCC2
VCC1
SCL2
GND1
SDA1
SDA2
Isolation
Side 2
Side 1 Side 2
GND1
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1.3 Functional Configuration
The pinouts of ISO1540 and ISO1541 are displayed in Figure 1. These devices have an input noise-filter
that prevents transient pulses of up to 5 ns from being passed to the output of the device.
Figure 1. ISO1540 and ISO1541 Pinout
The EVM is shown in Figure 2, it comes with an ISO1540 and an ISO1541 installed in place of U1 and U2
respectively. However, this EVM can be configured for use with two ISO1540s or two ISO1541s.
Figure 2. ISO154xEVM Top Photograph
An input or output pin can be tied either to supply voltage (VCCx) or Ground (GNDx) using the 4-pin
jumpers on the EVM (J3A to J10A on side 1 and J3B to J10B on side 2). These jumpers also provide
scope-probe access to each pin.
Each signal line (SDAx, SCLx) is configured with a 1-kΩ pull-up resistor (R1 to R8) to the corresponding
power supply (VCCx). Reconfigure the value of this pull-up resistor as per the application requirement.
3
SLLU166–June 2012
ISO154xEVM Low-Power Bidirectional I
2
C Isolators Evaluation Module
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