Datasheet

I
Source(SIFCOM)
SIFCOM
V
CC
V
CC
/2
I
Sink(SIFCOM)
MSP430FW429, MSP430FW428
MSP430FW427, MSP430FW425, MSP430FW423
SLAS383E –OCTOBER 2003–REVISED DECEMBER 2013 www.ti.com
Scan IF, V
CC
/2 Generator
over operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS V
CC
MIN TYP MAX UNIT
Analog supply AV
CC
= DV
CC
(connected together),
AV
CC
2.2 3.6 V
voltage AV
SS
= DV
SS
(connected together)
Scan IF V
CC
/2 2.2 V 250 350
generator operating C
L
at SIFCOM pin = 470 nF ±20%,
AI
CC
nA
supply current into f
refresh(SIFCOM)
= 32768 Hz
3 V 370 450
AV
CC
terminal
V
CC
/2 refresh
f
refresh(SIFCOM)
Source clock = ACLK 2.2 V, 3 V 30 32.768 kHz
frequency
Output voltage at pin C
L
at SIFCOM pin = 470 nF ±20%, AV
CC
/2 - AV
CC
/2 +
V
(SIFCOM)
AV
CC
/2 V
SIFCOM I
Load
= 1 µA 0.05 0.05
SIFCOM source 2.2 V -500
I
source(SIFCOM)
current
(1)
(see µA
3 V -900
Figure 20)
2.2 V 150
I
sink(SIFCOM)
SIFCOM sink current nA
3 V 180
I
Load1
= I
LOAD3
= 0 mA,
Time to recover from
t
recovery(SIFCOM)
I
Load2
= 3 mA, t
load(on)
= 500 ns, 2.2 V, 3 V 30 µs
voltage drop on load
C
L
at SIFCOM pin = 470 nF ±20%
Time to reach 98%
C
L
at SIFCOM pin = 470 nF ±20%,
t
on(SIFCOM)
after V
CC
/2 is 2.2 V, 3 V 1.7 6 ms
f
refresh(SIFCOM)
= 32768 Hz
switched on
SIFEN = 1, SIFVCC2 = 1, SIFSH = 0,
Settling time to
AV
CC
= AV
CC
- 100 mV, 2.2 V, 3 V 80
±V
CC
/512 (2 LSB)
f
refresh(SIFCOM)
= 32768 Hz
t
VccSettle(SIFCOM)
ms
after AV
CC
voltage
AV
CC
= AV
CC
+ 100 mV,
change
2.2 V, 3 V 3
f
refresh(SIFCOM)
= 32768 Hz
(1) The sink and source currents are a function of the voltage at the pin SIFCOM. The maximum currents are reached if SIFCOM is shorted
to GND or V
CC
. Due to the topology of the output section (see Figure 20) the V
CC
/2 generator can source relatively large currents but
can sink only small currents.
Figure 20. P6.x/SIFCHx Timing, SIFCHx Function Selected
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