AMIS−30585
Table 1. AMIS−30585 PIN FUNCTIONS
No.
1
Name
VSSA
RX_OUT
RX_IN
REF_OUT
M50HZ_IN
10O
I/O
Type
Description
P
Analog ground
2
Out
In
A
Output of input stage opamp
3
A
Positive input of input stage opamp
Reference output for stabilization
50.60 Hz input
4
Out
In
A
5
A
6
In/Out
Out
In
D, 5 V Safe
D, 5 V Safe
D, 5 V Safe
D, 5 V Safe
D, 5 V Safe
D, 5 V Safe
D, 5 V Safe
A
Programmable IO pin (open drain)
Test data output
7
TDO
8
TDI
Test data output (internal pull down)
Test clock (internal pull down)
Test mode select (internal pull down)
Test reset bar (internal pull down, active low)
Data output corresponding to transmitted frequency
Xtal input (can be driven by an internal clock)
Xtal output (output floating when XIN driven by external clock)
Digital ground
9
TCK
In
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
TMS
In
TRSTB
TX_DATA
XIN
In
Out
In
XOUT
VSS
Out
A
P
VDD
P
3.3 V digital supply
TXD
Out
In
D, 5 V Safe
D, 5 V Safe
D, 5 V Safe
D, 5 V Safe
D, 5 V Safe
D, 5 V Safe
D, 5 V Safe
D
SCI transmit output (open drain)
SCI receive input (Schmitt trigger output)
Programmable IO pin + interrupt (open drain)
SCI baud rate selection
RXD
IO2
In/Out
In
BR1
BR0
In
SCI baud rate selection
IO1
In/Out
In
Programmable IO pin (open drain)
Master reset bar (Schmitt trigger input, active low)
Test enable (internal pull down)
TX enable bar (open drain)
RESB
TEST
TX_ENB
TX_OUT
ALC_IN
VDDA
In
Out
Out
In
D, 5 V Safe
A
Transmitter output
A
Automatic level control input
P
3.3 V analog supply
P:
A:
D:
Power pin
Analog pin
Digital pin
Out:
In:
Output signal
Input signal
In/Out: Bi−directional pin
Pin 3: RX_IN
5 V Safe: IO that support the presence of 5 V on bus line
RX_IN is the positive analog input pin of the receiver low
noise input op−amp. Together with the pins two and three,
an active high pass filter is realized. This filter removes the
main frequency (50 or 60 Hz) from the received signal. The
filter characteristics are determined by external capacitors
and resistors. Typical values are given in Table 2. For these
values and after this filter, a typical attenuation of 80 dB at
50 or 60 Hz is obtained. Table 2 represents external
components connection. The present construction supposes
the presence of a previous formed with the coupling
transformer and a parallel capacitance is placed on the
Pin 1: VSSA
VSSA is the analog ground supply pin. It is strongly
recommended putting a decoupling capacitance between
this pin and the VDDA pin. This capacitance value is:
100 nF 10 percent ceramic. Connection path of the
capacitance to the VSSA and VDDA on the PCB should be
kept as short as possible in order to minimize the serial
resistance.
Pin 2: RX_OUT
mains. This last one performs a typical attenuation of 60 dB.
The combined effect of the two filters decreases the voltage
level of the main frequency well below the sensitivity of the
AMIS−30585.
RX_OUT is the output analog pin of the receiver low
noise input op−amp. This op−amp is in a negative feedback
configuration. To know how to use this pin, refer to the
explanations given for pin RX_IN.
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