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AC75 Hardware Interface Description
Strictly confidential / Preliminary
Function
Signal name
2
I
C interface
I2CDAT_SPIDO
SPI
SPIDI
Serial
I2CDAT_SPIDO
Peripheral
I2CCLK_SPICLK
Interface
SPICS
USB
VUSB_IN
USB_DN
USB_DP
Digital
DAC_OUT
Analog
Converter
General
GPIO1
Purpose
GPIO2
Input/Output
GPIO3
GPIO4
GPIO5
GPIO6
GPIO7
AC75_HD_V00.202
IO Signal form and level
I/O V
max = 0.2V at I = 2mA
OL
V
max = 0.8V
IL
V
min = 2.15V
IH
V
max =
min + 0.3V = 3.05V
VEXT
IH
I
V
max = 0.2V at I = 2mA
OL
V
min = 2.55V at I = -0.5mA
O
OH
V
max = 3.05V
OH
O
O
V
max = 0.8V
IL
V
min = 2.15V,
IH
V
max = VEXTmin + 0.3V = 3.05V
IH
I
V
min = 4.0V
IN
V
max = 5.25V
IN
I/O
Differential Output Crossover voltage
Range
I/O
V
min = 1.5V, V
CRS
CRS
Line to GND:
V
max = 3.6V
OH
V
typ = 3.2V
OH
V
min = 3.0V at I=-0.5mA
OH
V
max = 0.2V at I=2mA
OL
V
min = 2.24V
IH
V
max = 0.96V
IL
Driver Output Resistance
Z
= 32Ohm
typ
Pullup at USB_DP R
typ
O
V
max = 0.2V at I = 2mA
OL
V
min = 2.55V at I = -0.5mA
OH
V
max = 3.05V
OH
I/O
V
max = 0.2V at I = 2mA
OL
V
min = 2.55V at I = -0.5mA
I/O
OH
V
max = 3.05V
OH
I/O
I/O
V
max = 0.8V
IL
V
min = 2.15V,
I/O
IH
V
max = VEXTmin + 0.3V = 3.05V
I/O
IH
I/O
Page 91 of 120
Comment
I2CDAT is configured as
Open Drain and needs a pull-
up resistor in the host
application.
According to the I
Specification Version 2.1 for
the fast mode a rise time of
max. 300ns is permitted.
There is also a maximum
VOL=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.
If the Serial Peripheral
Interface is active the I
interface is not available.
If lines are unused keep pins
open.
All electrical characteristics
according to USB
Implementers' Forum, USB
2.0 Full Speed Specification.
max = 2.0V
Without Java: USB port
Under Java: Debug interface
for development purposes.
If lines are unused keep pins
open.
=1.5kOhm
PWM signal which can be
smoothed by an external filter.
Use the AT^SWDAC
command to open and
configure the DAC_OUT
output.
All pins which are configured
as input must be connected to
a pull-up or pull-down resistor.
If lines are unused (not
configured) keep pins open.
s
2
C Bus
2
C
27.04.2006
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