参数资料
型号: 73M1966B-KEYCHN
厂商: Maxim Integrated Products
文件页数: 10/13页
文件大小: 0K
描述: EVAL BOARD 73M1966B
标准包装: 1
系列: *

73M1866B Keychain Demo Board User Manual
UM_1866B_023
3 Connectors
This section describes the 73M1866B Keychain 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 2 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: J1 Connector Pins
Pin
1
3
Pin Name
FSIO
DX
Function
PCM Bidirectional Frame Sync
PCM Receive Digital Data
Pin
2
4
Pin Name
VCC
VCC
Function
3.3 V power in
3.3 V power in
Output
5
NC
6
CLKO
PCM Highway Clock
Output
7
9
11
13
15
17
DR
CSB
SCLK
SDO
SDI
SDT
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
8
10
12
14
16
18
CLKI
AUDIO
NC
NC
INTB
GND
PCM Highway Clock Input
Audio output for speaker
Interrupt Output - low true
Ground
Chain Mode
19
RSTB
Reset - low true input
20
GND
Ground
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.
Table 3: J2 Pin Descriptions
1
2
Pin
Name
TIP
RING
Function
Bidirectional Analog Signaling
Bidirectional Analog Signaling
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.
10
Rev. 1.0
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