參數(shù)資料
型號(hào)： PWL6030B1AECMR
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PBGA187
封裝： 7 X 7 MM, 0.40 MM PITCH, GREEN, FCBGA-187
文件頁(yè)數(shù)： 76/97頁(yè)
文件大?。?/td> 937K
代理商： PWL6030B1AECMR
SWCS045B
– SEPTEMBER 2010 – REVISED JUNE 2011
GENERAL-PURPOSE ADC
The GPADC consists of a 10-bit ADC combined with a 17-input analog multiplexer. The ADC implementation
consists of a successive approximation conversion. The GPADC enables the host processor to monitor a variety
of analog signals using analog-to-digital conversion on the input source. After the conversion completes, the host
processor reads the results of the conversion through the I2C interface.
The GPADC supports 17 analog inputs: 7 of these inputs are available on external balls and the remaining are
dedicated to internal resource monitoring. Three of the seven external inputs are associated with current sources
or reference voltages allowing measurements of resistive elements (battery type and temperature or other
thermal sensor). The reference voltages are available when the GPADC is enabled. The reference voltage
GPADC_REF4 can be disabled by register bit.
GPADC_IN0 is associated with a current source of 7
A. An additional 15-A current source can be enabled by
register bit. A comparator connected to this input is intended to detect the presence or absence of the battery
(resistance to ground
< 130 kΩ). The detection result is available at the BATREMOVAL ball.
GPADC_IN1 and GPADC_IN4 are associated with a voltage reference equal to the ADC reference and are
intended to measure temperature with an NTC sensor. In addition, a detection module is connected to
GPADC_IN1 to permanently monitor the temperature and gate the charge for the battery.
The monitored internal analog parameters are:
Main battery voltage (VBAT)
Backup battery voltage (VBKP)
VAC/VBUS charging source voltage
Main battery charge current (ICHG)
Thermal monitoring mechanisms (HOTDIE1, HOTDIE2)
USB OTG ID voltage level
The three external inputs associated to the current sources are:
GPADC_IN0: Main battery type detection (identification resistor in battery pack)
GPADC_IN1: Main battery temperature measurement (thermistor in battery pack)
GPADC_IN4: Other resistive sensor
The conversion requests are initiated by the host processor, either by software through the I2C or by hardware
through a dedicated external ball GPADC_START. This last mode is useful when real-time conversion is
required. An interrupt signal is generated at the end-of-sequence of the conversions.
There are two kinds of conversion requests:
Real-time conversion request (SRT)
Asynchronous conversion request (SW)
Real-Time Conversion Request (SRT)
The GPADC is activated when GPADC_START is asserted. When this occurs, the GPADC digital control fetches
the real-time selection register to determine which channels must be sampled and converted. A sequence of
conversion consists of 1 to 17 channels to convert and processes all queued, selected channels one after
another, starting with channel 0 and ending with channel 16. At the end of each conversion, the GPADC writes
the conversion result into the corresponding results register. An INT interrupt is generated at the end of the
sequence of conversions.
If a GPADC_START real-time request occurs while a software-initiated conversion sequence is running, the
ongoing software conversion is aborted, the real-time conversion sequence is started, and a new
software-initiated conversion is rescheduled at the end of the GPADC_START sequence.
Asynchronous Conversion Request (SW)
Software can also require conversions asynchronously with respect to the GPADC_START ball for
general-purpose use. These conversion cases are not critical in terms of start-of-conversion positioning.
78
Copyright
2010–2011, Texas Instruments Incorporated
相關(guān)PDF資料
PDF描述
PWL6030B1AECMRR 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PBGA187
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PWL6030B1AFCMRR 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PBGA187
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