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參數(shù)資料
| 型號： | TDA5345HT |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 運動控制電子 |
| 英文描述： | 5 V spindle & VCM driver combo |
| 中文描述： | DISK DRIVE MOTOR CONTROLLER, 2 A, PQFP64 |
| 封裝： | LOW PROFILE, PLASTIC, TQFP-64 |
| 文件頁數(shù)： | 31/44頁 |
| 文件大?。?/td> | 213K |
| 代理商： | TDA5345HT |
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1999 June 10
31
Philips Semiconductors
Preliminary specification
5 V spindle & VCM driver combo
TDA5345HT
Depending on the external CLOCK value, the programmable CLOCK divider has to be programmed according to the
following table :
Table 17
Division factor to program in order to get 500 kHz for the -3 V switched cap. regulator :
Adjustable bandgap :
An internal regulated voltage source (called BandGap) delivers a very accurate voltage to many different circuitry inside
the IC. This voltage (1.23 V) is almost independant of power supply, temperature and process spread. However, there
is still a +/- 3% spread on this voltage. To come to about +/- 0.5%, it is possible to adjust this voltage from an external
micro controller with a very accurate voltage source and an ADC. The following table gives the voltage added or
substracted to the BandGap voltage according to the code written in register 2, bit 4 to 6.
CLOCK
REGNEGCLK[2:0]
DIVISION FACTOR
10 MHz
12.5 MHz
15 MHz
16.5 MHz
20 MHz
25 MHz
30 MHz
33 MHz
000
001
010
011
100
101
110
111
20
22
30
32
40
50
60
66
Fig.26 -3V switched cap. regulator
Vdd5
Load
Switch
manager
Band Gap
1.23V
500 kHz
Programmable
divider
CLOCK
RegNegClk[2,0]
3 bits
Neg3V
PumpNeg3V
(35)
(36)
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