73M1866B-KEYCHN Maxim Integrated Products, 73M1866B-KEYCHN Datasheet - Page 6

• Manufacturer Part Number: 73M1866B-KEYCHN
• Description: BOARD KEYCHAIN INF DANUBE EVM
• Manufacturer: Maxim Integrated Products

Specifications of 73M1866B-KEYCHN

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

73M1966B Demo Board User Manual
2 Connectors
This section describes the 73M1966B Demo Board connectors. All the digital signals and power supply
connections are made through a 20-pin header connector. The audio monitor is also brought out on this
connector. Table 1 describes the pins for the J1 connector. For convenience, most digital signals are
grouped with the PCM signals on the odd pins from pin 1 to pin 7, and the PCM CLKI pin is on pin 8. The
SPI signals can be found on the odd pins 9 through 17. Reset is on pin 19. The interrupt output is on pin
16. There are two power pins on pins 2 and 4 and two ground pins on pins 18 and 20. The audio monitor
output can be found on pin 10. There is also a CLKO pin that can be used for the rare case where the
73M1866B is used in the master mode.
Table 2 describes the J2 connector pins. These are the bi-directional PSTN network connections that
pass the audio signals to and from the FXO.
The signals on the TIP and RING pins should also have a DC current that would normally come from the
PSTN. This current will usually be in the range of 20 to 100 mA, but typically about 40 mA. This current
is necessary for the FXO to operate normally. The FXO will not operate if the current drops below
approximately 13 mA.
Table 5 describes the J3 connector pins. J3 is used to connect a host PC to the Demo Board to provide
GUI control.
6
Pin
1
3
5
7
9
11
13
15
17
19
Pin
1
3
5
7
9
Pin Name
FSIO
DX
N/C
DR
CSB
SCLK
SDO
SDI
SDT
RSTB
Pin Name
SDI
SDO
SCLK
CSB
VCC
PCM Bidirectional Frame Sync
PCM Receive Digital Data Output
No Connect
PCM Transmit Digital Data Input
Chip Select - low true
SPI Clock
Serial Control Data Out
Serial Control Data In
Serial Data Thru – used in Daisy
Chain Mode
Reset - low true
Serial Control Data In
Serial Control Data Out
Serial Clock
Chip Select - low true
Pin
1
2
3
4
Function
Function
Name
N/C
TIP
RING
N/C
Table 1: J1 Pin Descriptions
Table 2: J2 Pin Descriptions
Table 3: J3 Pin Descriptions
Function
No Connect
Bidirectional Analog Signaling
Bidirectional Analog Signaling
No Connect
Pin
2
4
6
8
10
12
14
16
18
20
Pin
2
4
6
8
10
Pin Name
VCC
VCC
CLKO
CLKI
AUDIO
N/C
N/C
INTB
GND
GND
Pin Name
N/C
GND
GND
GND
N/C
3.3V power in
3.3V power in
PCM Highway Clock Output
PCM Highway Clock Input
Audio output for speaker
No Connect
No Connect
Interrupt Output - low true
Ground
Ground
No Connect
No Connect
Function
Function
UM_1966B_022
Rev. 1.2