AX.25 Modem
CMX7031/CMX7041
CMX7031 CMX7041
Signal
Name
Type
64-pin
Q1/L9
48-pin
Q3/L4
Description
52
53
54
55
45
-
DVSS
-
PWR Digital Ground.
NC
IP
Reserved – do not connect this pin.
46
47
SCLK
SYSCLK 2
C-BUS: The C-BUS serial clock input from the µC.
Synthesised Digital System Clock Output 2.
OP
C-BUS: The C-BUS chip select input from the µC - there is
no internal pull-up on this input.
48
CSN
IP
56
57
58
59
60
61
-
-
NC
OP
OP
Reserved – do not connect this pin.
1
2
3
4
EPSI
Serial Memory Serial Interface: SPI bus output.
Serial Memory Serial Interface: SPI bus clock.
EPSCLK
EPSO
IP+PD Serial Memory Serial Interface: SPI bus input.
EPSCSN
OP
Serial Memory Serial Interface: SPI bus Chip Select.
Used in conjunction with BOOTEN2 to determine the
operation of the bootstrap program.
62
5
BOOTEN1
IP+PD
Used in conjunction with BOOTEN1 to determine the
operation of the bootstrap program.
63
64
6
7
BOOTEN2
DVSS
IP+PD
PWR Digital Ground.
On this device, the central metal pad (which is exposed on
Q1 and Q3 packages only) may be electrically unconnected
or, alternatively, may be connected to Analogue Ground
(AVss).
EXPOSED
EXPOSED
SUBSTRATE
~
METAL PAD METAL PAD
No other electrical connection is permitted.
Notes: IP
OP
=
=
=
=
=
=
Input (+ PU/PD = internal pull-up/pull-down resistor)
Output
Bidirectional
3-state Output
Power Connection
No Connection - should NOT be connected to any signal.
BI
TS OP
PWR
NC
3.1
Signal Definitions
Table 1 Definition of Power Supply and Reference Voltages
Signal Name
Pins
AVDD
DVDD
RFVDD
CPVDD
VDEC
VBIAS
AVSS
Usage
Power supply for analogue circuits.
Power supply for digital circuits.
Power supply for RF synthesiser circuits.
Power supply for RF charge pump.
Power supply for core logic, derived from DV by on-chip regulator.
Internal analogue reference level, derived from AV
Ground for all analogue circuits.
Ground for all digital circuits.
AV
DV
DD
DD
RFV
CPV
DD
DD
V
DEC
DD
V
BIAS
.
DD
AV
DV
SS
SS
DVSS
RFVSS
RFV
Ground for all RF circuits.
SS
2013 CML Microsystems Plc
Page 9
D/7031/7041_FI-4.x/5
CMLMICRO [ CML MICROCIRCUITS ]
