Hot-Swap SCSI Backplane
SR2300 2U Server Chassis Technical Product Specification
Intel Order Number A94546-004
38
P80C652FBB features include:
•
Operating frequency is 12 MHz
•
80C51-based architecture
•
Four 8-bit I/O ports
•
Two 16-bit timer/counters
•
Full-duplex UART facilities
•
I
2
C serial interface
•
Two power control modes: idle mode and power-down mode
•
Operating temperature range: 0
°
C to +70
°
C
6.2.2.1 I
2
C Serial Communication-SI01
The I
2
C pins are alternate functions to port pins P1.6 and P1.7. Because of this, P1.6 and P1.7
on these parts do not have a pull-up structure as found of the 80C51. Therefore, P1.6 and P1.7
have open drain outputs on the 80C652.
6.2.2.2 I
2
C Electrical Input/Output Specifications
The I
2
C bus allows communication between devices made from different technologies, which
might also use different supply voltages.
For devices with fixed input levels, operating on a supply voltage of +5V
±
10%, the following
levels have been defined:
•
V
ILmax
= 1.5V (maximum input low voltage)
•
V
IHmin
= 3V (minimum input High voltage)
Devices operating on a fixed supply voltage different from +5V (e.g. I
2
L), must also have these
input levels of 1.5V and 3V for V
IL
and V
IH
respectively.
For devices operating over a wide rage of supply voltages (e.g. CMOS), the following levels
have been defined:
•
V
ILmax
= 0.3V
DD
(maximum input Low voltage)
•
V
IHmin
= 0.7V
DD
(minimum input High voltage)
For both groups of devices, the maximum output Low value has been defined:
•
V
OLmax
= 0.4V (max. output voltage Low) at 3mA sink current
The maximum low-level input current at V
OLmax
of both the SDA pin and the SCL pin of an I
2
C
device is -10uA, including the leakage current of a possible output stage.
The maximum high-level input current at 0.9V
DD
of both the SDA pin and SCL pin of an I
2
C
device is 10uA, including the leakage current of a possible output stage.
The maximum capacitance of both the SDA pin and the SCL pin of an I
2
C device is 10pf.
Summary of Contents for SR2300 - FRONT BEZEL BLK
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