参数资料
| 型号： | NCV7240DPR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 20/26页 |
| 文件大小： | 0K |
| 描述： | IC DVR RELAY 8CH LOW SIDE 24SSOP |
| 标准包装： | 2,500 |
| 系列： | * |
NCV7240
Serial Connection
Daisy chain setups are possible with the NCV7240. The serial setup shown in Figure 29 highlights the NCV7240 along with
any 16 bit device using a similar SPI protocol. Particular attention should be focused on the fact that the first 16 bits which are
clocked out of the SO pin when the CSB pin transitions from a high to a low will be the Diagnostic Output Data from the Fault
Output Register. These are the bits representing the status of the IC. Additional programming bits should be clocked in which
follow the Diagnostic Output bits. The timing diagram shows a typical transfer of data from the microprocessor to the SPI
connected IC’s.
CSB SCLK
IC4
NCV7240
CSB SCLK
IC3
Any IC
using 16 Bit
SPI
protocol
CSB SCLK
IC2
Any IC
using 16 Bit
SPI
protocol
CSB SCLK
IC1
Any IC
using 16 Bit
SPI
protocol
SI
SO
SI
SO
SI
SO
SI
SO
Figure 29. Serial Daisy Chain
CSB
SCLK
SI
1 st CMD
2nd CMD
3rd CMD
4th CMD
Figure 30. Serial Daisy Chain Timing Diagram
Table 2. SERIAL DAISY CHAIN DATA PATTERN
CLK = 16 bits
CLK = 32 bits
CLK = 48 bits
CLK = 64 bits
IC4
IC3
IC2
IC1
micro
1st CMD
IC4 DIAG
IC3 DIAG
IC2 DIAG
IC1 DIAG
2nd CMD
1st CMD
IC4 DIAG
IC3 DIAG
IC2 DIAG
3rd CMD
2nd CMD
1st CMD
IC4 DIAG
IC3 DIAG
4th CMD
3rd CMD
2nd CMD
1st CMD
IC4 DIAG
Table 2 refers to the transition of data over time of the Serial Daisy Chain setup of Figure 29 as word bits are shifted through
the system. 64 bits are needed for complete transport of data in the example system. Each column of the table displays the status
after transmittal of each word (in 16 bit increments) and the location of each word packet along the way.
http://onsemi.com
20
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