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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)： | 28/44頁 |
| 文件大?。?/td> | 213K |
| 代理商： | TDA5345HT |
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1999 June 10
28
Philips Semiconductors
Preliminary specification
5 V spindle & VCM driver combo
TDA5345HT
Power on reset
The Power On Reset circuit monitors the voltage level of +5 V supply voltage (pin named VddAna1).
The PorN output (pin #25) is set HIGH when the +5 V supply voltage arise above a specified voltage threshold plus an
hysteresis. This LOW to HIGH transition is delayed by a time T
C
that is determined by the external PorCap capacitor
(connected to pin #26).
This PorN output remains HIGH until +5 V supply drops below its voltage threshold. PorN output immediately becomes
LOW. A brake after retract is initiated and the digital section is reset while PorN remains LOW.
The C
PorCap
capacitor is charged by a constant current I
PorCap
. The voltage on PorCap pin is compared to the POR circuit
reference voltage V
PorRef
. The T
C
time is set then by the following equation:
V
I
PorCap
(19)
The T
C
time value only depends on the external C
PorCap
capacitor value.
The value of the +5 V supply threshold voltage can be adjusted by adding an external resistor divider on the Por5Adj(28)
. Internally, pin is designed as it is described in figure 20.
It is advised to connect external capacitors on pins Por5Adj to filter the power supplies noise. See figure 21.
T
C
C
PorCap
-------------------
×
C
PorCap
2 10
6
–
--1.23V
×
C
PorCap
615 10
3
×
=
=
=
Fig.21 Power on reset timing
VDD
V
hysteresis
threshold
t
t
POR_N
1 V
T
c
T
c
VddAna1
Por5Adj
(28)
R
L5
R
H5
to the POR circuit
Fig.22 Por5vAdj pin
GndAna2
(32)
(24)
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