User manual

Advantech SOM-Express Design Guide
Chapter 2 SOM-Express Overview 29
*1. From ”Infrared Data Association – Infrared Dongle Interface v1.1”
*2. Vcc=5.0V±5%
2.5.1.10 I2C
Table 2.28 I2C I/O Voltage
Symbol Parameter Min Max Unit Note
V
IL
Input Low
Voltage
-0.5 0.3Vdd V
V
IH
Input High
Voltage
0.7Vdd Vdd+0.5 V
V
OL
Output Low
Voltage
0 0.4 V
*1. The I2C Bus Specification V2.1.
*2. Vdd is the voltage which the pull-up resistor are connected.
2.5.1.11 SMBus
Table 2.29 SMBus I/O Voltage
Symbol Parameter Min Max Unit Note
V
IL
Input Low
Voltage
- 0.8 V
V
IH
Input High
Voltage
2.1 Vdd V
V
OL
Output Low
Voltage
- 0.4 V
*1. System Management Bus (SMBus) Specification v2.0.
*2. Vdd is the voltage which the pull-up resistor are connected.
2.6 AC Specification
2.6.1 PCI-Bus AC Spec.
Refer to “PCI Local Bus Specification Revision 2.2 December 18, 1998” Chapter 4.2
for the details.
2.6.2 Universal Serial Bus (USB) AC Spec.
Refer to “Universal Serial Bus Specification Revision 1.1 September 23, 1998”
Chapter 7 for the details.
2.6.3 Audio AC Spec.
Refer to “Audio Codec ’97 Revision 2.1 May 22, 1998” Chapter 9 for digital signals
AC spec. and Chapter 10 for analog performance spec.
2.6.4 VGA AC Spec.
Please refer to “VESA and Industry Standards and Guidelines for Computer Display
Monitor Timing Version 1.0, Revision 0.8” for the monitor timing specification.