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參數(shù)資料
| 型號： | TDA5153BG |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 光電元器件 |
| 英文描述： | Pre-amplifier for Hard Disk Drive HDD with MR-read/inductive write heads |
| 中文描述： | 4 CHANNEL READ WRITE AMPLIFIER CIRCUIT, PQFP48 |
| 封裝： | 7 X 7 MM, 1.40 MM HEIGHT, PLASTIC, SOT-313, LQFP-48 |
| 文件頁數(shù)： | 16/28頁 |
| 文件大?。?/td> | 128K |
| 代理商： | TDA5153BG |
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1997 Jul 02
16
Philips Semiconductors
Preliminary specification
Pre-amplifier for Hard Disk Drive (HDD)
with MR-read/inductive write heads
TDA5153
8.11
Head unsafe
The HUS pin is an open-collector output. Consequently,
when the pin is not connected to an external pull-up
resistor, HUS is LOW. HUS pins can be connected
together in case of operation with more than one amplifier.
It is used to detect abnormal/unexpected operation.
Sleep mode:
HUS is HIGH, to permit working with more
than one amplifier.
Standby mode:
HUS is HIGH, to permit working with
more than one amplifier.
Read mode:
if in the configuration register d3 = 1, HUS is HIGH
if in the configuration register d3 = 0, HUS goes LOW
for:
– R
ext
pin open, short-circuited to ground or to V
CC
(read current too low or too high)
– Low V
CC
and V
CC(WD)
conditions. A low supply
voltage detector is placed close to the V
CC
and
V
CC(WD)
pins.
Detection of low V
CC
(main general supply): a V
CC
supply
voltage below 4.0 V
±
5% is flagged to the HUS pin.
The voltage detection range is then 4.2 to 3.8 V with an
hysteresis of 110 mV
±
10%. Detection of low V
CC(WD)
(writer dedicated supply): a fault will be flagged at HUS pin
if V
CC(WD)
drops 0.8 V
±
10% below V
CC
. One must be
aware that such a detection is only aimed to warn for a
catastrophic situation. Indeed, V
CC(WD)
should never be
below V
CC
.
Test mode:
HUS is HIGH except when the TAS detector
is ON. If a thermal asperity is detected, HUS goes LOW.
Servo write mode:
HUS is LOW
Write mode:
if in the configuration register d3 = 1, HUS is LOW
if in the configuration register d3 = 0, HUS goes HIGH
for: the write current may be inhibited if d1 = 0 in the
configuration register.
– R
ext
pin open, short-circuited to ground or to V
CC
(write current too low or too high)
– Write data input frequency too low (WDIx
WDIy)
– Write head Wx
Wy open, Wx or Wy short-circuited
to ground (switching to write mode makes HUS LOW;
after the transient the HUS detection circuitry is
activated; the target for the head-open detect time is
15 ns)
– Write-head still left biased while not selected
– Low V
CC
and V
CC(WD)
conditions (write current inhibit
can be active or inactive).
The same detector is used for read and write mode. HUS
goes LOW again between 0.5 and 1
μ
s after the last
unsafe condition was detected.
8.12
HUS survey
Notes
1.
2.
HUS survey: A-test mode = analog test mode.
In servo mode, the performance of the IC is not guaranteed.
HUS
DATA BIT D3
MODE
STATE
0
1
Sleep mode
Standby mode
Read mode
A-test mode
(1)
TAS mode
Write mode
A-test mode
(1)
Servo mode
(2)
HIGH
HIGH
ACTIVE
HIGH
ACTIVE
ACTIVE
HIGH
LOW
HIGH
HIGH
HIGH
HIGH
ACTIVE
LOW
HIGH
LOW
Active mode
Read
Write
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| TDA5153X | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Pre-amplifier for Hard Disk Drive HDD with MR-read/inductive write heads |
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