MC35XS3400 Datasheet, PDF (21/45 Pages) Freescale Semiconductor, Inc – Quad High Side Switch (Quad 35mΩ)

FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
OPERATIONAL MODES
The 35XS3400 has four operating modes: Sleep, Normal,
Fail-safe and Fault. Table 5 and Figure 11 summarize details
contained in succeeding paragraphs.
The Figure 10 describes an internal signal called IN_ON[x]
depending on IN[x] input.
t_IN
IN[x]
IN_ON[x]
Figure 10. IN_ON[x] internal signal
The 35XS3400 transits to operating modes according to
the following signals:
• wake-up = RST or WAKE or IN_ON[0] or IN_ON[1] or
IN_ON[2] or IN_ON[3],
• fail = (V_DD Failure and VDD_FAIL_en) or ( Watchdog
time-out and FSI input not shorted to ground ),
• fault = OC[0:3] or OT[0:3] or SC[0:3] or UV
( UV ) or ( OV and OV_dis ).
Table 5. 35XS3400 Operating Modes
Mode wake-up fail fault
Comments
Sleep
0
Normal
1
Fail-safe 1
Fault
1
x = Don’t care.
x x Device is in Sleep mode. All
outputs are OFF.
0 0 Device is currently in Normal
mode. Watchdog is active if
enabled.
1 0 Device is currently in Fail-safe
mode due to watchdog timeout
or V_DD Failure conditions. The
output states depend on the
corresponding input in case
FSI is open.
X 1 Device is currently in Fault
mode. The faulted output(s) is
(are) OFF. The safe autoretry
circuitry is active to turn-on
again the output(s).
(wake-up=0)
Sleep
(fail=0) and (wake-up=1) and (fault=0)
Fail-Safe
(wake-up=1) and
(fail=1)
and (fault=0)
(wake-up=0)
(wake-up=1)
and (fault=1)
(wake-up=0)
(fail=1) and
(wake-up=1)
and (fault=1)
Fault
(fail=1) and
(wake-up=1)
and (fault=0)
(fail=0) and
(wake-up=1)
and (fault=1)
(fail=0) and
(wake-up=1)
and (fault=0)
Normal
(fail=0) and (wake-up=1) and (fault=0)
(fail=1) and (wake-up=1) and (fault=0)
Figure 11. Operating Modes
SLEEP MODE
The 35XS3400 is in Sleep mode when:
• V_PWR and V_DD are within the normal voltage range,
• wake-up = 0,
• fail = X,
• fault = X.
This is the Default mode of the device after first applying
battery voltage (VPWR) prior to any I/O transitions. This is
also the state of the device when the WAKE and RST and
IN_ON[0:3] are logic [0]. In the Sleep mode, the output and
all unused internal circuitry, such as the internal regulator, are
off to minimize draw current. In addition, all SPI-configurable
features of the device are as if set to logic [0].
Analog Integrated Circuit Device Data
Freescale Semiconductor
35XS3400
21