TPS65800_07 Datasheet, PDF (67/98 Pages) Texas Instruments – SINGLE-CELL Li-ION BATTERY- AND POWER-MANAGEMENT IC

TPS65800
www.ti.com
SLVS606C – SEPTEMBER 2005 – REVISED FEBRUARY 2007
FUNCTIONALITY GUIDE – ANALOG TO DIGITAL CONVERTER
10 BIT SUCCESSIVE APPROXIMATION ADC
ADC Input Channels
Trigger Mode
Internal
External
Charge
Current,
Thermistor
temperature,
IC junction
temperature,
RTC_OUT
voltage, OUT
voltage,
Battery
voltage
ANLG1 and
ANLG2
voltages
GPIB, I²C
driven, Repeat
Fixed
internally
Selectable via Selectable via
I²C
I²C
Conversion Converter Mode
Count
1, 4, 8, 16, 32, Single, Average,
64, 128, 256 Find max value,
Find min value
Selectable via
I²C
Selectable via
I²C
Trigger Delay
Range
Min Step
0-750 µs,
16 steps
50 µs
Selectable Selectable
via I²C
via I²C
Wait Time, Multiple
Conversions
µs: 20, 40, 60, 80, 160,
240, 320, 640
ms: 1.28, 1.92, 2.56,
5.12, 10.24, 15.36, 20.48
Selectable via I²C
Power Up
Default
ADC off
AGND 2
6 INTERNAL
CHANNELS
ADC
CONTROL
LOGIC
ADC
8 CHANNEL
MUX
A/D
CONVERTER
OUT
SYSTEM POWER BUS
ANLG 1
ANLG 2
EXTERNAL ANALOG
INPUT VOLTAGE
ADC _ REF
C17
4.7 mF
A2
A2
Figure 46. Required External Components, Recommended Values, External Connections
ANALOG-TO-DIGITAL CONVERTER
Overview
The TPS65800 has a 10 bit integrated successive approximation A/D, capable of running A/D conversions on
eight distinct channels in a variety of modes. Two of the eight channels are connected to uncommitted pins
ANLG1 and ANLG2, and can be used to convert external voltages. The other six channels monitor system
parameters which are critical to the overall system monitoring. The channel selection is set via I²C.
A dedicated set of I²C registers enables configuration of the ADC to perform a conversion cycle with either a
single conversion or a multiple conversions. The ALU generates a data set containing maximum value detection,
minimum value detection and average value calculation for each conversion cycle. Each cycle can be performed
a single time or multiple times.
Input Channels
The following channels are available for selection via the I²C register ADC_SET bits CHSEL_SET bits:
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