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參數(shù)資料
| 型號(hào)： | DRV401AIRGWRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQCC20 |
| 封裝： | 5 X 5 MM, GREEN, PLASTIC, QFN-20 |
| 文件頁數(shù)： | 14/36頁 |
| 文件大?。?/td> | 963K |
| 代理商： | DRV401AIRGWRG4 |
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DRV401
SBVS070B JUNE 2006 REVISED MAY 2009
www.ti.com
21
ERROR CONDITIONS
In addition to the Over-Range flag that indicates signal
clipping in the output amplifier (differential amplifier), a
system error flag is provided. The ERROR flag indicates
conditions when the output voltage does not represent the
primary current. It is active during a demagnetization
cycle, during a power-fail or brown-out. It also goes active
with an open or short-circuit in the probe loop. As soon as
the error condition is no longer present and the circuit has
returned to normal operation, the flag resets.
Both the ERROR and Over-Range flags are open-drain
logic outputs. They can be connected together for a
wired-OR and require an external pull-up resistor for
proper operation.
The following conditions result in ERROR flag activation
(ERROR asserts low):
1.
The probe comparator stays low for more than 32
s.
This condition occurs either if the probe coil
connection is open or if the supply voltage dips to the
level where the required saturation current cannot be
reached. During the 32
s timeout, the ICOMP driver
remains active but goes inactive thereafter. In case of
recovery, ERROR is low and the ICOMP driver remains
in reset for another 3.3ms.
2.
The probe driver pulse-width is less than 280ns for
three consecutive periods. This condition indicates
either a shorted field probe coil or a fully-saturated
sensor at start-up. If this condition persists longer
than 25
s and then recovers, the ERROR flag
remains low and ICOMP is in reset for another 3.3ms.
If the condition lasts less than 25
s, the ERROR flag
recovers immediately and the ICOMP driver is not
interrupted.
3.
During demagnetization, if the cycle is aborted early
by pulling DEMAG low, the ERROR flag stays low for
another 3.3ms (ICOMP is disabled during this time).
4.
An open compensation coil is detected (longer than
100
s). Note: the probe driver, the PWM signal
filter and the ICOMP driver continue to function in
normal mode—only the ERROR flag is asserted in
this case. This condition indicates that not enough
current is flowing in the ICOMP driver output; this
condition might be the result of a high-resistance
compensation coil or the connection of an external
driver. Detection of this condition can be disabled
by setting the CCdiag pin low.
5.
At power-on after VDD1 crosses the +4V threshold,
the ERROR flag is low for approximately 42
s.
6.
A supply voltage low (brown-out) condition lasts
longer than 100
s. Recovery is the same as
power-up, either with or without a demag cycle.
PROTECTION RECOMMENDATIONS
The inputs IAIN1 and IAIN2 require external protection to
limit the voltage swing beyond 10V of the supply voltage.
The driver outputs ICOMP1 and ICOMP2 can handle high
current pulses protected by internal clamp circuits to the
supply voltage. If repeated over-currents of large
magnitudes are expected, connect external Schottky
diodes to the supply rails. This external protection
prevents current flowing into the die.
The probe connections IS1 and IS2 are protected with
diode clamps to the supply rails. In normal applications, no
external protection is required. The maximum current must
be limited to
±75mA.
All other pins offer standard protection—see the Absolute
Maximum Ratings table.
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