User's Manual Part 1

MC75 Hardware Interface Description
Strictly confidential / Draft
s
MC75_V00.190a Page 70 of 91 15.02.2005
Function Signal name IO Signal form and level Comment
ASC1
Serial
interface
RXD1
TXD1
CTS1
RTS1
O
I
O
I
V
OL
max = 0.2V at I = 2mA
V
OH
min = 2.55V at I = -0.5mA
V
OH
max = 3.05V
V
IL
max = 0.8V
V
IH
min = 2.0V
V
IH
max = VEXTmin + 0.3V = 3.05V
Serial interface for AT
commands or data stream.
If lines are unused keep pins
open.
I2CCLK O V
OL
max = 0.2V at I = 2mA
V
OH
min = 2.55V at I = -0.5mA
V
OH
max = 3.05V
I
2
C interface
I2CDAT I/O V
OL
max = 0.2V at I = 2mA
V
IL
max = 0.8V
V
IH
min = 2.0V
V
IH
max = VEXTmin + 0.3V = 3.05V
I2CDAT is configured as
Open Drain and needs a pull-
up resistor in the host
application.
According to the I2C 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.
VUSB_IN I V
IN
min = 4.0V
V
IN
max = 5.25V
USB_DN I/O
USB
USB_DP I/O
Differential Output Crossover voltage
Range
V
CRS
min = 1.5V, V
CRS
max = 2.0V
Driver Output Resistance
Z
DRV
typ = 32 Ohm
If lines are unused keep pins
open.
SD_D0
SD_D1
SD_D2
SD_D3
I/O
SD_CLK O
SD_WP I
SD_CMD O
SD card
interface
SD_DETECT I
V
OL
max = 0.2V at I = 2mA
V
OH
min = 2.55V at I = -0.5mA
V
OH
max = 3.05V
V
IL
max = 0.8V
V
IH
min = 2.0V
V
IH
max = VEXTmin + 0.3V = 3.05V
SD card interface can be
connected to VEXT of MC75
or to external power supply.
Rise and fall time of SD_CLK
signal: max. 10ns.
If lines are unused keep pins
open.
USC0 (DAI0)
O
USC1 (DAI1)
I
USC2 (DAI2)
O
USC3 (DAI3)
I
USC4 (DAI4)
I
USC5 (DAI5) I
Digital Audio
interface
USC6 (DAI6) O
V
OL
max = 0.2V at I = 2mA
V
OH
min = 2.55V at I = -0.5mA
V
OH
max = 3.05V
V
IL
max = 0.8V
V
IH
min = 2.0V
V
IH
max = VEXTmin + 0.3V = 3.05V
See Table 9 for details.
If unused keep pins open.