- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄43901 > L7250 (STMICROELECTRONICS) VOICE COIL MOTOR CONTROLLER, PQFP64 PDF資料下載
參數(shù)資料
| 型號： | L7250 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 運動控制電子 |
| 英文描述： | VOICE COIL MOTOR CONTROLLER, PQFP64 |
| 封裝： | TQFP-64 |
| 文件頁數(shù)： | 24/46頁 |
| 文件大?。?/td> | 478K |
| 代理商： | L7250 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁當(dāng)前第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁
L7250
30/46
2) A second approach is considering to have the VCM in stop position; to enable it in current mode con-
figuration driving current in the right direction in order to be sure to mantain the stop position; to decre-
ment the 15bit DAC value to reach the zero current condition using the 10bit ADC to measure the
current value.
In the following diagram a detailed flow chart is presented.
Figure 10. VCM Current Loop Offset Calibration 2
Set VCM inTristate
Write Reg.03H
VCMState[2:0] = 001
START
Current Mode “ZeroIout”
Calibration Routine
Set 15BitDAC to have VCM Current
with no motion
Write Reg.09H & Reg.0Ah
Dac[14:0] = DACvalue
Set the GainSw to High or Low
Set VCM in En.Current Mode
Write Reg.03H
VCMState [2:0] = 011
Call
IoutDigitalVal
Routine
Polarity check
ADC_DATA[9] = 0
Flag_A=0
EXIT
Current Mode “ZeroIout”
Calibration Routine
Yes
No
Flag_A=0
DACvalue=1200 ( 0x4B0 )
Note 1
DACvalue-=1
DACvalue<-1200
EXIT with Error 1
Calibration not performed
Positive offset to big
Yes
No
START 10Bit ADC Conversion
of the Iout Channel
Write Reg.0CH
ADC_CH_ADDR[1:0] =00
ADC_START=1
EXIT
IoutDigitalVal
Routine
Wait End of
Conversion
Read 10Bit ADC
Read Reg.0BH
ADC_DATA[9:2]
Read Reg.0CH
ADC_DATA[1:0]
YES
NO
START
IoutDigitalVal
Routine
Update the 15BitDAC
Write Reg.09H & Reg.0Ah
Dac[14:0] =DACvalue
Iout
Yes
StoreDACvalue
As reference for
ZEROIout
No
Flag_A=1
EXIT with Error 2
Calibration not performed
Negative offset to big
Wait 20msec
Call
IoutDigitalVal Routine
Iout_Offset = ADC_DATA[9:0]
Note 2
Note 1 : once the VCM will be enabled in current mode with the DAC value at 1200 the current will keep the motor against the crash stop position
Note 2 : with the VCM in tristate, the result of the digital conversion of the Iout Channel has to be used as ZERO current offset value
ADC_DATA[9:0] -= Iout_offset
( Subtract the offset )
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L7980A | 3.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
| L7980 | 3.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
| L7980TR | 3.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
| L7981ATR | SWITCHING REGULATOR, DSO8 |
| L7981TR | SWITCHING REGULATOR, DSO8 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L7250E1.2 | 功能描述:電源開關(guān) IC - 配電 DSD POWER RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| L7252E2.6 | 功能描述:電源開關(guān) IC - 配電 DSD POWER RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| 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 |
| L728 | 制造商:BURNDY 功能描述:L-DIE |
| L7290 | 制造商:CIPS 功能描述:CUTTER OBLIQUE SEMI FLUSH 109MM |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。