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參數(shù)資料
| 型號： | TPS65800RTQTG4 |
| 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： | 8 X 8 MM, GREEN, PLASTIC, QFN-56 |
| 文件頁數(shù)： | 65/98頁 |
| 文件大?。?/td> | 2077K |
| 代理商： | TPS65800RTQTG4 |
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www.ti.com
FUNCTIONAL OVERVIEW
SLVS606C – SEPTEMBER 2005 – REVISED FEBRUARY 2007
Table 10. ADC input channel overview
Channel
Connection
Parameter Sampled
Voltage Range Under
Special Features
Full Scale Reading
LSB
Normal Operating
(Internal reference
value
selected )
CH1
ANLG1 pin
User defined
Internal pullup current
2.535 V
Full scale
source programmable
reading
CH2
ANLG2 pin
2.535 V
via I2C: 0/10/50/60
A
÷ 1023
CH3
ISET1 pin
Voltage proportional to
0 V (charger off) to
—
2.535 V
charge current
2.525 V (fast charge)
CH4
TS pin
Voltage proportional to pack 0 V (short) to 4.7v (no
Internal 20-
A pullup
2.535 V
temperature
thermistor)
current source (ON
only when AC/USB
are present)
CH5
Internal
Voltage proportional to IC
1.85 V at TJ = 25°C,
—
2.535 V
junction
junction temperature
–6.5 mV/
°C slope typ
temperature
CH6
RTC_OUT
Internal LDO output voltage
0 V to 3.3 V
—
4.7 V
pin
CH7
OUT pin
System Power bus voltage
0 V to 4.4 V
—
4.7 V
CH8
BAT pin
Battery pack positive
0 V to 4.4 V
—
4.7 V
terminal voltage
The TPS65800 ADC can be subdivided in four sections:
1. Input selection: The input selection section has two major blocks, the input bias control and an 8
channel MUX. The input bias control provides the bias currents that are applied to pins ANLG1 and
ANLG2 and pin TS. The TS pin bias current is fixed (20
A typ), and the bias currents for pins ANLG1
and ANLG2 are set on I2C register ADC_WAIT.
The TS and ANLG1 pin current sources are automatically enabled when the input power is detected,
providing the required setup to measure a pack thermistor temperature (TS pin) or a battery ID resistor
(ANLG1 pin). ANLG1 and ANLG2 can be used to measure external resistive loads or analog voltages.
The bias current sources are always connected to the OUT pin internally.
The internal MUX connects one of the monitored analog inputs to the ADC engine, following the selection
defined on register ADC_SET.
2. ADC engine: The ADC engine uses an internal or external voltage reference, as defined by the
ADC_REF bit on the ADC_SET control register. If the internal reference is selected ADC_REF is
connected to an internal LDO that regulates the ADC_REF pin voltage to generate the ADC supply and
internal voltage reference. The internal LDO maximum output current is 6 mA typical, and a conversion
should be started only after the external capacitor is fully charged.
If an external reference is used it should be connected to the ADC_REF pin. When an external reference
is selected the internal LDO connected to ADC_REF is disabled. Care must be taken when selecting an
external reference as the ADC reference voltage, as it affects the ADC LSB absolute value.
3. Trigger control and synchronization: The ADC engine starts a conversion of the selected input when
the trigger control circuit sends a start command. The trigger control circuit starts the ADC conversion and
transfers the ADC output data to the arithmetic logic unit (ALU) at the end of the conversion. It also
synchronizes the data transfer from the ALU to the I2C ADC_READING register at the end of a
conversion cycle, and generates the ADC status information sent to the ADC registers.
An ADC engine conversion is triggered by the TPS65800 trigger control circuit using either an internal
trigger or an external trigger. The internal trigger is automatically generated by the TPS65800 at the end
of each ADC engine conversion, following the timing parameters set on I2C registers ADC_SET,
ADC_DELAY and ADC_WAIT.
The GPIO3 pin can be used as an external trigger if the bit ADC_TRG_GPIO3 is set HI, in the I2C register
ADC_DELAY. In the external trigger mode a new conversion is started after the GPIO3 pin has an edge
transition, following the timing parameters set on I2C registers ADC_SET, ADC_DELAY and ADC_WAIT.
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