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參數(shù)資料
| 型號(hào)： | TDA5345HT |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類(lèi)： | 運(yùn)動(dòng)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(yè)數(shù)： | 17/44頁(yè) |
| 文件大?。?/td> | 213K |
| 代理商： | TDA5345HT |
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1999 June 10
17
Philips Semiconductors
Preliminary specification
5 V spindle & VCM driver combo
TDA5345HT
Table 5
Numeral application with CLOCK = 16 MHz
T
IMER
2
TIMER2 is used to measure the delay between two zero-crossings and also to set the maximum commutation delay
through comdelim delay:
Explanation: COMDELIM is the maximum value that can be reached by TIMER 2. So, this is the maximum delay
between 2 zero-crossings
. The maximum commutation delay is then
half this value!
Calculations:
Delay between 2 zero-crossings (
Zc):
step size
min
maximum
= 2
LSB
/ ClockOutPrescaler
= (2
LSB
-1) / ClockOutPrescaler (bits from 0 to (LSB-1) are internally set to 1)
= (2
(MSB+1)
- 1) / ClockOutPrescaler
Maximum commutation delay:
step size
maximum
= 2
(LSB-1)
/ ClockOutPrescaler
= (2
(MSB)
- 1) / ClockOutPrescaler
Table 6
Numeral application with CLOCK = 16 MHz
DELAYS
CLOCKOUTPRESCALER=
CLOCK/4 = 4 MHZ
CLOCKOUTPRESCALER=
CLOCK/8
= 2 MHZ
CLOCKOUTPRESCALER=
CLOCK/16 = 1 MHZ
CLOCKOUTPRESCALER=
CLOCK/32
= 0.5 MHZ
MIN
STEP
MAX
MIN
STEP
MAX
MIN
STEP
MAX
MIN
STEP
MAX
Blank
WatchDog
StartUp
3
μ
s
127
μ
s
4.1 ms 65.5 ms 65.5 ms 8.2 ms
4
μ
s
128
μ
s 2.05 ms
63
μ
s
7
μ
s
255
μ
s
8
μ
s
256
μ
s
8.2 ms 131 ms 16.4 ms 16.4 ms 262 ms 32.8 ms 32.8 ms 524 ms
127
μ
s
4.0 ms
15
μ
s
511
μ
s
16
μ
s
512
μ
s
255
μ
s
8.2 ms
31
μ
s
1023
μ
s 1024
μ
s 16.4 ms
32
μ
s
511
μ
s
DELAYS
CLOCKOUTPRESCALER=
CLOCK/4 = 4 MHZ
CLOCKOUTPRESCALER=
CLOCK/8 = 2 MHZ
CLOCKOUTPRESCALER=
CLOCK/16 = 1 MHZ
CLOCKOUTPRESCALER=
CLOCK/32 = 0.5 MHZ
MIN
STEP
MAX
MIN
STEP
MAX
MIN
STEP
MAX
MIN
STEP
MAX
Z
C
63
μ
s
31
μ
s
64
μ
s
32
μ
s
1.02 ms
511 ms
127
μ
s
63
μ
s
128
μ
s 2.05
μ
s
64
μ
s
255
μ
s
127
μ
s
256
μ
s
128
μ
s
4.1 ms
2.05 ms
511
μ
s
255
μ
s
512
μ
s
256
μ
s
8.2 ms
4.1 ms
ComDeLim
1.02 ms
Fig.10 Timer 2 configuration.
0
1
2
3
4
5
6
7
8
9
10
11
ComDeLim
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