LM3S6918 Luminary Micro, Inc, LM3S6918 Datasheet - Page 507

• Manufacturer Part Number: LM3S6918
• Description: Lm3s6918 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

21.2.7
21.2.8
July 26, 2008
Hibernation Module
The Hibernation Module requires special system implementation considerations since it is intended
to power-down all other sections of its host device. The system power-supply distribution and
interfaces to the device must be driven to 0 V
regulator controlled by HIB.
The external voltage regulators controlled by HIB must have a settling time of 250 μs or less.
Table 21-23. Hibernation Module AC Characteristics
a. This parameter is highly sensitive to PCB layout and trace lengths, which may make this parameter time longer. Care
Figure 21-4. Hibernation Module Timing
Synchronous Serial Interface (SSI)
Table 21-24. SSI Characteristics
Parameter No
Parameter No.
32.768 KHz
(internal)
must be taken in PCB design to minimize trace lengths and RLC (resistance, inductance, capacitance).
/WAKE
H1
H2
H3
H4
H5
H6
H7
S1
S2
S3
S4
S5
S6
S7
S8
S9
/HIB
t
t
t
HIB_REG_WRITE
HIB_TO_VDD
Parameter
t
WAKE_ASSERT
XOSC_SETTLE
Parameter
t
WAKETOHIB
t
t
t
t
t
clk_high
HIB_HIGH
clk_low
HIB_LOW
clk_per
t
t
t
t
t
t
H1
DMd
DMs
DMh
DSs
DSh
clkrf
Parameter Name
SSIClk cycle time
SSIClk high time
SSIClk low time
SSIClk rise/fall time
Data from master valid delay time
Data from master setup time
Data from master hold time
Data from slave setup time
Data from slave hold time
Internal 32.768 KHz clock reference rising edge to /HIB asserted
Internal 32.768 KHz clock reference rising edge to /HIB deasserted
/WAKE assertion time
/WAKE assert to /HIB desassert
XOSC settling time
Time for a write to non-volatile registers in HIB module to complete
HIB deassert to VDD and VDD25 at minimum operational level
Preliminary
a
DC
Parameter Name
or powered down with the same external voltage
Min
20
40
20
40
2
0
-
-
-
Nom
1/2
1/2
7.4
-
-
-
-
-
-
H3
65024
Max
H4
26
20
-
-
-
-
-
-
system clocks
t clk_per
t clk_per
H2
Unit
ns
ns
ns
ns
ns
ns
LM3S6918 Microcontroller
Min
62
62
20
92
-
-
-
Nom
200
30
-
-
-
-
-
Max
124
250
-
-
-
-
-
Unit
ms
507
μs
μs
μs
μs
μs
μs