Datasheet

TPS65950
www.ti.com SWCS032E–OCTOBER 2008–REVISED JANUARY 2011
9.3 Channel Voltage Input Range
Table 9-2 lists the channel voltage input ranges.
Table 9-2. Analog Input Voltage Range
Channel Min Typ Max Unit Prescaler
No prescaler
ADIN0: Battery type/GP input 0 1.5 V dc current source for battery identification through external
resistor (10 μA typical)
No prescaler
ADCIN1: Battery temperature 0 1.5 V dc current source for temperature measurement through
external resistor (10 to 80 μA programmable)
ADIN2: GP input
(1)
0 2.5 V MADC prescaler from 0 to >1.5 V
ADIN3: GP input
(1)
0 2.5 V MADC prescaler from 0 to >1.5 V
ADIN4: GP input
(1)
0 2.5 V MADC prescaler from 0 to >1.5 V
ADIN5: GP input
(1)
0 2.5 V MADC prescaler from 0 to >1.5 V
ADIN6: GP input
(1)
0 2.5 V MADC prescaler from 0 to >1.5 V
ADIN7: GP input
(1)
0 2.5 V MADC prescaler from 0 to >1.5 V
(1) GP inputs must be tied to ground when TPS65950 internal power supplies (VINTANA1 and VINTANA2) are off.
9.3.1 Sequence Conversion Time (Real-Time or Nonaborted Asynchronous)
Table 9-3 lists the sequence conversion timing characteristics. Figure 9-1 is a conversion sequence
general timing diagram.
Table 9-3. Sequence Conversion Timing Characteristics
Parameter Comments Min Typ Max Unit
F Running frequency 1 MHz
T = 1/F Clock period 1 μs
N Number of analog inputs to convert in a single sequence 0 16
Tstart SW1, SW2, or USB asynchronous request or real-time STARTADC
3 4 μs
request
Tsettling time Settling time to wait before sampling a stable analog input (capacitor 5 12 20 μs
bank charge time)
Tsettling is calculated from the max ((Rs + Ron)*Cbank) of the 16
possible input sources (internal or external). Ron is the resistance of
the selection analog input switches (5 kΩ). This time is
software-programmable in the open-core protocol (OCP) register.
Tstartsar The successive approximation registers ADC start time. 1 μs
Tadc time The successive approximation registers ADC conversion time. 10 μs
Tcapture time Tcapture time is the conversion result capture time. 2 μs
Tstop 1 2 μs
Full conversion sequence One channel (N = 1)
(1)
22 39
μs
time
All channels (N = 16)
(1)
352 624
Without Tstart and Tstop: One channel (N = 1)
(1)
18 33
Conversion sequence
μs
time
Without Tstart and Tstop: All channels (N = 16)
(1)
288 528
STARTADC pulse
STARTADC period is T 0.33 24 μs
duration
(1) Total sequence conversion time general formula: Tstart + N*(1 + Tsettling + Tadc + Tcapture) +Tstop
Copyright © 2008–2011, Texas Instruments Incorporated MADC 127
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