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參數(shù)資料
| 型號(hào)： | TA8876FA |
| 元件分類： | 接收器 |
| 英文描述： | AUDIO/VIDEO DEMODULATOR, PDSO30 |
| 封裝： | 0.375 INCH, 1 MM PITCH, PLASTIC, SSOP-30 |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 443K |
| 代理商： | TA8876FA |
TDF8554J
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 1 — 31 August 2011
16 of 56
NXP Semiconductors
TDF8554J
4
45 W power amplifier with multiple voltage regulator
There are two possible situations:
the start-up diagnostics are enabled (IB1[D1] = 1) and the amplifier start is not
enabled (IB1[D0] = 0), bit “start-up diag busy bit” is reset when the start-up
diagnostics are completed, and the I2C-bus data bits are set. Toggling the start-up
diagnostics bit re-starts the start-up diagnostics. The invalid bits are set and bit
“start-up diag busy bit” indicates that the start-up diagnostics are not completed.
the start-up diagnostics are enabled (IB1[D1] = 1) and the amplifier start is enabled
(IB1[D0] = 1). After the first stage, the amplifier is started and when start-up is
completed, just before the start-up mute release (DC output voltage is 1.4 V below
midtap voltage), bit “start-up diag busy bit” indicates that the start-up diagnostic is
completed. It is not necessary to toggle the start-up diagnostics and has no purpose.
The first and second stages of the start-up diagnostics can be repeated:
Start-up with the start-up diagnostics (IB1[D1] = 1) and the amplifier start enabled
(IB1[D0] = 1). Wait until DB4[D6] = 0 which indicates that the start-up diagnostics cycle is
completed. Read the start-up diagnostics information. Shut down the amplifier by making
the start-up bit logic 0. When DB4[D6] = 0, the amplifier is completely shut down and a
new start-up cycle can be programmed.
[1]
DBx[D3] indicates a shorted load; DBx[D1] indicates a short to VP; DBx[D0] indicates a short to ground.
When set, D4, D5 have no meaning.
If during the start-up diagnostics an engine start occurs, the generated offset to measure
the DC load is reduced and the start-up diagnostics cannot be performed correctly. In this
case the invalid combination DBx[D4:D5] = 11 is set.
The start-up diagnostics information in the I2C-bus bits is combined with the AC load
detection allowing the start-up diagnostics information to be read when IB4[D0] = 1 (the
advanced load detection is enabled). If IB4[D0] = 0, only normal and not normal loads can
be detected.
Remark: the shorted load, and short to VP or ground information from the start-up
diagnostics is cleared after an I2C-bus read. Bits DBx[D5] and DBx[D4] indicate the real
situation: when the short is removed, the bits are cleared. The DBx[D5] and DBx[D4]
information, generated at start-up, is refreshed after a new start-up diagnostics cycle.
Table 5.
Start-up diagnostics I2C-bus bits
DC load bits[1]
Meaning
DBx[D5]
DBx[D4]
0
normal load
0
1
line driver mode
1
0
open load
1
invalid: overvoltage or
undervoltage (VP <10V) has
occurred, or start-up
diagnostics not completed, or
channel has short to VP;
indicated in second stage
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