Table of Contents
Advertisement
AC75 Hardware Interface Description
Strictly confidential / Preliminary
3.3.2 Signal States after Startup
Table 6 describes the various states each interface pin passes through after startup and
during operation.
As shown in Figure 5 and Figure 6 the pins are in undefined state while the module is
initializing. Once the startup initialization has completed, i.e. when CTS is high and the
software is running, all pins are in defined state. The state of several pins will change again
once the respective interface is activated or configured by AT command.
Table 6: Signal states
Signal name
Undefined
during startup
SYNC
L
CCIN
I, PU(100k)
CCRST
L
CCIO
L
CCCLK
L
CCVCC
L
RXD0
I, PU
TXD0
I, PU
CTS0
L
RTS0
I, PU
DTR0
I, PU
DCD0
L
DSR0
L
RING0
I, PU
RXD1
H
TXD1
I, PD(330k)
CTS1
L
RTS1
I, PD(330k)
SPIDI
I
SPICS
I
I2CDAT_SPIDO
I
I2CCLK_SPICLK
I
GPIO1
I, PU
GPIO2
I, PU
GPIO3
I, PU
GPIO4
I, PD
GPIO5
L
GPIO6
I
GPIO7
I, PU
GPIO8
L
GPIO9
I
GPIO10
I
DAC_OUT
L
DAI0
I
DAI1
I
DAI2
I
DAI3
I
DAI4
I
DAI5
I
DAI6
I
For abbreviations, see below.
AC75_HD_V00.202
state
Defined state after
initialization
O
I, PU(100k)
O
O
O
2.9V
O
I, PD(330k)
O
I, PD(330k)
I
O
O
O
O
I, PD(330k)
O
I, PD(330k)
Tristate
Tristate
O
O
Tristate
Tristate
Tristate
Tristate
Tristate
Tristate
Tristate
Tristate
Tristate
Tristate
O
Tristate
Tristate
Tristate
Tristate
Tristate
Tristate
Tristate
Page 32 of 120
s
Active state after configuration by AT command
2
GPIO
SPI
I
I
Tristate
O
Tristate
O
IO
O
O
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
C
DAI
O
I
O
O
I
I
I
27.04.2006
Advertisement
Table of Contents
