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LE75282BBVC 参数 Datasheet PDF下载

LE75282BBVC图片预览
型号: LE75282BBVC
PDF下载: 下载PDF文件 查看货源
内容描述: [Telecom Circuit, 1-Func, PQFP44, GREEN, PLASTIC, MS-026ACB, TQFP-44]
分类和应用: 电信电信集成电路
文件页数/大小: 20 页 / 387 K
品牌: ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
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Le75282  
Data Sheet  
APPLICATIONS  
Figure 6, on page 16 illustrates the internal functionality of the Le75282 device.  
There are numerous ways to control the Le75282 LCAS device using the P1’-P3’/LDx and OFFx inputs. A one-to-one wiring of  
SLAC P1 to LCAS P1’, SLAC P2 to LCAS P2’, and SLAC P3 to LCAS P3’, is usually not the desired connection. When using the  
Le79Q224x/Le79228 SLAC as the controller, wiring of the control port varies dependent upon the desired operating states. P1,  
P2, and P3 control lines are used to control the ISLIC device and the LCAS device. When LDx is high, the P-bus controls the  
operating states of the ISLIC via C1, C2, and C3. When LDx is low, the P-bus controls the relay drivers and the test load in the  
ISLIC device as well as the operating states of the LCAS device via RD1, RD2, and RD3. So functionality between the ISLIC  
device and the LCAS device needs to be coordinated in order to provide the desired performance.  
Figure 5. ISLIC Device and LCAS Control  
Le79232 ISLIC  
VCC  
RD1-RD3 controlled by SLAC I/O Register  
Standby (scan)  
C
1
D
E
C
O
D
E
R
TIP Open  
OHT  
Disconnect  
P1  
P1  
C
2
D
E
M
U
X
Active High Battery  
Active Low Battery  
P2  
P2  
P3  
Le79228  
C
3
SLAC  
P3  
R
D
1
R
D
2
R1 (Relay Driver)  
Test (Load) Switch  
LD1  
LD1  
Le75282 LCAS  
VDD  
R
D
1
P1'  
P2'  
Switch  
Control  
L
R
D
2
Re-wiring as  
necessary  
A
T
C
H
R
D
3
P3'  
LD1  
Connections are shown for channel one only  
Control and wiring scenarios for the ISLIC device and LCAS device follows.  
The following LCAS operating state options are available through P-bus control:  
1. Idle/Talk, Ringing, Test, Test/Monitor  
2. Idle/Talk, Ringing, Test/Monitor, Test Ringing  
3. Idle/Talk, Ringing, Test, All Off  
4. Idle/Talk, Ringing, Test, Test/Monitor, Test Ringing  
5. Idle/Talk, Ringing, Test, Test/Monitor, Test Ringing, All Off  
Note, for all five states, the All Off operating state can be asserted by driving the OFFx pin Low.  
For option 1, LCAS CFG = 0 and LCAS P3’ = 0, wire SLAC P1 to LCAS P2’, and wire SLAC P3 to LCAS P1’, do not wire SLAC  
P2 to the LCAS. The test load (if enabled) can then be applied independent of the LCAS operating state. When SLAC P1 = 1, the  
Ringing and Test/Monitor state will be activated when the external ringing signal is at zero cross (assuming CCR4 RMODE is set  
for external ringing (1) and ZXR is set for enable zero cross ringing relay operation (0)). For the Ringing state this is the desired  
operation. For the Test/Monitor state, the delay in activation needs to be considered in the firmware.  
For option 2, LCAS CFG = 0 or 1 and LCAS P3’ = 1, wire SLAC P1 to LCAS P2’, and wire SLAC P3 to LCAS P1’, do not wire  
SLAC P2 to the LCAS. The test load (if enabled) can then be applied independent of the LCAS operating state. When SLAC P1  
= 1, the Ringing and Test Ringing state will be activated when the external ringing signal is at zero cross (assuming CCR4 RMODE  
is set for external ringing (1) and ZXR is set for enable zero cross ringing relay operation (0)). This is desired operation.  
14  
Zarlink Semiconductor Inc.