MC33388 Datasheet, PDF (9/28 Pages) Motorola, Inc – Fault Tolerant CAN Interface

MC33388
DEVICE DESCRIPTION
Figure 3. State Machine And Operation Modes
Normal mode (1, 1)
(BUS failure, ON)
(0, 1)
(1, 1)
Go to sleep mode (0, 1)
(Wake up event, OFF³)
(1, 1)
(1, 1)
(1, 0)
(0, 0)
(1, 1)¹
Sleep mode (0, 0)
(1, 0)
(0, 1)
Receive Only mode (1, 0)
(0, 0)
(0, 0)⁴
(1, 0)¹
(Wake up event^1,2, OFF)
(0, 0)
(0, 1)
Stand-by V_BAT mode (0, 0)
wake-up event
(bus message, wake pin)
(VBAT fail flag, ON)
(1, 0)
(Wake up event, ON)
Legend:
Transceiver mode (STB state, EN state)
(NERR function, INH state)
power up
NERR: BUS - Bus error is flagged
WAKE - Wake-up event is flagged
BAT - BAT fail is flagged
INH: ON - INH is switched on
OFF - INH is floating
1 _{with permanent VDD}
2 _{VDD is still switched on}
3 _{if no wake-up occurs after 25µs}
4 _{as long as INH is on}
Table 1 • Truth Table
STB EN
Mode
INH
NERR
RX
RTL
I_DD (4)
I_BAT (4)
0
0
0
0
VBAT
Standby¹
Sleep²
High
Floating
Active LOW:
wake-up interrupt signal
(if V_DD is present)
Switched to
V_BAT
Switched to
V_BAT
5µA
Not
applicable
typ. 15µA
typ. 15µA
0
1
Go to sleep Floating
command
Switched to
V_BAT
1
0 Receive Only³
High
Active LOW:
Switched to
800µA
V_BAT power-on flag High: recessive state
V_DD
Low: dominant state
1
1
Normal
High
Active LOW:
Switched to 2.3mA (5)
typ.
error flag
V_DD
3.3mA (6)
150µA
NOTES:
1. Wake-up interrupts are released when entering normal operating mode.
2. If go to sleep command was used before (EN may turn LOW as VDD drops, without affecting internal functions because of fail safe functionality.
3. VBAT power-on flag will be reset when entering normal operation mode.
4. Value are typical, without bus load current.
5. In recessive state.
6. In Dominant State, value with no load at bus.
MC33388
MOTOROLA
9