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參數(shù)資料
型號(hào)： TLV320AIC29IRGZR
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQCC48
封裝： 7 X 7 MM, GREEN, PLASTIC, QFN-48
文件頁數(shù)： 35/87頁
文件大小： 1051K
代理商： TLV320AIC29IRGZR
TLV320AIC29
SLAS494B DECEMBER 2005 REVISED OCTOBER 2007
www.ti.com
40
VREF is the SAR ADC reference
Vsar is input to the SAR ADC
The AIC29 supports programmable autoauxiliary measurement mode, which can be enabled using control
register 0CH/page 1. In this mode, the AIC29 can auto start the auxiliary measurement after a programmable
interval. The user can program minimum and maximum threshold values through a register. If the measurement
goes outside the threshold range, the AIC29 sets a flag in the read only control register 0CH/page 1, which gets
cleared after the flag is read. The AIC29 can also be configured to send an active high interrupt over GPIO1
by setting D9 of control register 0CH/page 1. The duration of the interrupt is approximately 2 ms.
See the section Conversion Time Calculation for the AIC29 in this data sheet for timing diagram and conversion
time calculation
Port Scan
If making measurements of VBAT, AUX1, and AUX2 is desired on a periodic basis, the Port Scan mode can
be used. This mode causes the AIC29 to sample and convert battery input and both auxiliary inputs. At the end
of this cycle, the battery and auxiliary result registers contain the updated values. Thus, with one write to the
AIC29, the host can cause three different measurements to be made.
See the section Issues at the end of this data sheet for details of a known issue with this mode.
See the section Conversion Time Calculation for the AIC29 and subsection Port Scan Operation in this data
sheet for timing diagrams and conversion time calculations.
Buffer Mode
The AIC29 supports a programmable buffer mode, which is applicable auxiliary (BAT, AUX1, AUX2, TEMP1,
TEMP2). Buffer mode is implemented using a circular FIFO with a depth of 64. The number of interrupts
required to be serviced by a host processor can be reduced significantly buffer mode. Buffer mode can be
enabled using control register 02H/page1.
Figure 31. Circular Buffer
Converted data is automatically written into the FIFO. To control the writing, reading and interrupt process, a
write pointer (WRPTR), a read pointer (RDPTR) and a trigger pointer (TGPTR) are used. The read pointer
always shows the location, which will be read next. The write pointer indicates the location, in which the next
converted data is going to be written. The trigger pointer indicates the location at which an interrupt will be
generated if the write pointer reaches that location. Trigger level is the number of the data points needed to be
present in the FIFO before generating an interrupt. Figure 31 shows the case when trigger level is programmed
as 32. On resetting buffer mode, RDPTR moves to location 1, WRPTR moves to location 1, and TGPTR moves
to location equal to programmed trigger level.
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