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参数资料
| 型号： | L7250 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | VOICE COIL MOTOR CONTROLLER, PQFP64 |
| 封装： | TQFP-64 |
| 文件页数： | 5/46页 |
| 文件大小： | 478K |
| 代理商： | L7250 |
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L7250
1.2 Default serial port timing Table
1.3 Inverted clock comunication modes (bit 7, Reg05H) = 1
To set the bit7, Reg05H to 1, entering this different comunication mode, a writing process using the default co-
munication protocol (see the above paragraph) must be used.
After the SEN falling edge, the internal state machine is waiting for the first SCLK rising edge. This means that
if the SCLK line starts from a low level the first rising edge, respecting the setup time Tefcr, is considered, and
is used to read the R/W bit. The internal state machine must see 16 SCLK rising edges to validate the write
operation. The write mode is started if the R/W bit is low on the first rising edge of SCLK. The read mode is
started if the R/W bit is high on the first rising edge of SCLK. The ID, Address, and Data are all then subsequent-
ly read by the L7250 on the rising edges of SCLK (See Figure 2).
The microcontroller has to read (latch) the data on the falling edge of the SCLK signal. L7250 presents the data
on the SCLK rising edge. During a read mode the last address bit is latched by the L7250 on the eighth rising
edge of SCLK. The internal state machine then turns the SDATA bit around for the L7250 to assume control at
the next SCLK falling edge (the first falling edge after the 8th SCLK rising edge).
Symbol
Parameter
Min
Max
Unit
Tcc
Serial clock period
30
ns
Tch
Serial clock high time
13
ns
Tcl
Serial clock low time
13
ns
Tcds
Serial data setup time to clock falling edge (write mode)
5
ns
Tcdh
Serial clock falling edge to serial data hold time (write mode)
4
ns
Tedh
Serial clock falling edge to serial data hold time (read mode)
5
ns
Tcdd
Serial data setup time to clock falling edge (read mode)
5
ns
Tel
Serial Enable low time
490
ns
Teh
Serial Enable high time
30
ns
Tefcf
Serial Enable falling edge to serial clock falling edge
17
ns
Tcfer
Serial clock falling edge to Serial enable rising edge
17
ns
Tdly
SDATA turn around delay time
0
ns
Note 1: All specifications with respect to 50% of signal switching thresholds
Note 2: Reading mode tested at Max 20Mhz
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相关代理商/技术参数 |
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| L725MAG | 制造商:Apex Tool Group 功能描述:TAPE, 1 IN. X 25 FT, 700 SERIES, MAGNETIC END HOOK 制造商:Lufkin 功能描述:TAPE MEASURE, MAGNETIC END HOOK 25FT 1IN; Tape Measure Type:Manual; Measuring Range Max:25ft; Blade Width:1"; Case Color:Orange; Tool Body Material:ABS; Blade Finish:Yellow Clad; Blade Length:25ft ;RoHS Compliant: NA |
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