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參數資料
| 型號： | TPS65820RSHTG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 8-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC56 |
| 封裝： | 7 X 7 MM, GREEN, PLASTIC, QFN-56 |
| 文件頁數： | 69/98頁 |
| 文件大小： | 2290K |
| 代理商： | TPS65820RSHTG4 |
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GPIO3
INTERNAL ADC
CONVERSIONSTATUS
FIRST
SAMPLE
LAST
SAMPLE
ON
OFF
t
WAIT(TRG)
tDLY(TRG)
CONVERSIONCYCLE
GPIO3
INTERNAL ADC
CONVERSIONSTATUS
FIRST
SAMPLE
LAST
SAMPLE
ON
OFF
TWAIT(TRG)
TDLY(TRG)
CONVERSIONCYCLE
Continuous Conversion Operation (Repeat Mode)
www.ti.com .............................................................................................................................................................. SLVS663B – MAY 2006 – REVISED APRIL 2008
With the default power-up settings (HOLDOFF=LO, ADC_DELAY register), the TPS65820 executes a multiple
sample conversion cycle if the first sample is taken when the trigger is at its active level. Subsequent samples
are converted at the end of the wait time, even if the trigger returns to the non-active level. The external trigger
level edge is ignored until the current conversion cycle ends.
Figure 50. ADC Conversion Triggerd by GPIO3 Positive Edge Triggered Active Level Hi; Holdoff = LC
If the sample conversion needs to be synchronized with an external trigger, during multiple sample conversion
cycles, the control bit HOLDOFF should be set to HI. When the holdoff mode is active, the internal trigger starts
a sample conversion only if the external trigger was detected and is at its active level at the end of the wait time,
as shown in Figure 51.
Figure 51. ADC Conversion Triggerd by GPIO3 Positive Edge-Triggered Active Level HI,
Holdoff = HI, Four Sample Cycles
When the multiple sample cycles are executed the host must configure the maximum and minimum limits for the
ADC output using registers DLOLIM1, DLOLIM2, DHILIM1 and DHILIM2. A conversion cycle ends if any
individual conversion result exceeds the maximum limit value or is below the minimum limit value. When an out
of limit conversion is detected an interrupt is sent to the host, and the ADC_STATUS bit on register ADC
READING_HI is set to DONE.
The TPS65820 ADC can be set to operate in a continuous conversion mode, with back-to-back conversion
cycles executed. The REPEAT mode is targeted at applications where an input is continuously monitored for a
period of time, and the host must be informed if the monitored input is out of the range set by I2C registers
DLOLIM1, DLOLIM2, DHILIM1 and DHILIM2. In REPEAT mode each conversion is started when the ADC trigger
(internal or external) is detected, and a new conversion cycle is started when the current conversion cycle ends.
All the trigger and sampling modes available for normal conversion cycles are available in repeat mode.
Executing I2C read operations to get the ADC readings for average, minimum, maximum and last sample values
is possible in REPEAT mode. However, this is not a recommended operation, as the REPEAT mode does not
generate a DONE status flag making it difficult to synchronize the ADC data reading to the end of a conversion
cycle.
The recommended use of the REPEAT mode is :
1. Configure the ADC conversion cycle : trigger mode, sample mode, select input signal, etc.
2. Configure the HI and LO limits for the ADC readings
3. Set the ADC_DELAY register bit REPEAT to HI
4. Toggle ADC_DELAY register bit ADC_EN bit from LO to HI
Copyright 2006–2008, Texas Instruments Incorporated
71
Product Folder Link(s): TPS65820
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