TC65 Terminal Hardware Interface Description
Confidential / Released
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TC65 Terminal_HD_V02.000b
Page 58 of 65
19.02.2007
5.9
Characteristics of the I
2
C interface
Table 35: Characteristics of the I
2
C interface
Function
Signal name
IO Signal form and level
Comment
I2CCLK_SPICLK O
R
O
≈
33
Ω
V
OL
max = 0.25V at I = 2mA
V
OH
min = 2.50V at I = -0.5mA
V
OH
max = 3.05V
I
2
C interface
I2CDAT_SPIDO I/O
R
O
≈
33
Ω
V
OL
max = 0.25V at I = 2mA
V
IL
max = 0.8V
V
IH
min = 2.0V
V
IH
max = 3.05V
I2CDAT is configured as
Open Drain and needs a
pull-up resistor in the host
application.
According to the I
2
C Bus
Specification Version 2.1
for the fast mode a rise
time of max. 300ns is
permitted. There is also a
maximum V
OL
=0.4V at
3mA specified.
The value of the pull-up
depends on the capacitive
load of the whole system
(I2C Slave + lines). The
maximum sink current of
I2CDAT and I2CCLK is
4mA.
If lines are unused keep
pins open.
5.10
Characteristics of the SPI interface
Table 36: Characteristics of the SPI interface
Function
Signal name
IO Signal form and level
Comment
I2CCLK_SPICLK O
I2CDAT_SPIDO O
SPICS O
SPI
Serial
Peripheral
Interface
SPIDI I
R
O
≈
33
Ω
V
OL
max = 0.25V at I = 2mA
V
OH
min = 2.50V at I = -0.5mA
V
OH
max = 3.05V
Fmax = 6.5MHz (possible)
1.083
MHz
(recommended)
V
IL
max = 0.8V
V
IH
min = 2.0V
V
IH
max = 3.05V
If the Serial Peripheral
Interface is active the I
2
C
interface is not available.
If lines are unused keep
pins open.
