Datasheet

TPS65930/TPS65920
www.ti.com SWCS037G–MAY 2008–REVISED APRIL 2011
8.3 Channel Voltage Input Range
Table 8-2 lists the analog input voltage minimum and maximum values.
Table 8-2. Analog Input Voltage Range
Channel Min Typ Max Unit Prescaler
No prescaler
ADIN0: General-purpose input 0 1.5 V DC current source for battery identification through external
resistor (10 μA typical)
ADIN2: General-purpose input
(1)
0 2.5 V Prescaler in the MADC to be in range 0 to >1.5 V
(1) General-purpose inputs must be tied to ground when TPS65920/TPS65930 internal power supplies (VINTANA1 and VINTANA2) are off.
8.3.1 Sequence Conversion Time (Real-Time or Nonaborted Asynchronous)
Table 8-3 lists the sequence conversion timing characteristics.
Table 8-3. 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 2
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 two
possible input sources (internal or external). Ron is the resistance of the
selection analog input switches (5 kΩ). This time is
software-programmable by 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 One channel (N = 1)
(1)
22 39
μs
sequence time
Both channels
(1)
352 624
Without Tstart and Tstop: One channel (N = 1)
(1)
18 33
Conversion sequence
μs
time
Without Tstart and Tstop: Both channels
(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 79
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