33902 Datasheet, PDF (13/31 Pages) Freescale Semiconductor, Inc – High Speed CAN Interface with Embedded 5.0 V Supply

FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
STBY 1
EN 1
and V_IO > V_IO low threshold
STATE DIAGRAMS
if V_IO ON ⁽²⁾
Normal mode (STBY 1, EN 1)
V_DD ON, INH ON
Driver ON; Receiver ON, SPLIT 2.5 V
STBYB 1
EN 1
ERR report: wake-up source &
(V_DD low and CAN bus failure) ⁽⁷⁾
STBY 1
EN 1
STBY 1
EN 1
Automatic transition
STBYB 0 Go to sleep (STBY 0, EN 1)
EN 1
V_DD ON, INH ON
Terminated to ground, SPLIT HZ
ERR report: Wake-up
STBY 0
EN 1
STBY 0
EN 1
t>t_H
(From any state if
V_I/O low, after
T_VIO-SLP, if
V_SUP > V_SUV
Sleep (STBY 0, EN 0)
V_DD OFF, INH HZ ⁽⁶⁾
Terminated to ground, SPLIT HZ
Controlled transition
(4)
ERR report: Wake-up ⁽²⁾
STBY 1
EN 0
STBY 1
EN 0
Listen Only (STBY 1, EN 0)
V_DD ON, INH ON
Driver OFF; Receiver ON, SPLIT 2.5 V
ERR report: BATfail) ⁽¹⁾
(V_DD low, local failure) ⁽³⁾
STBY 1
EN 0
STBY 0
EN 0
Legend:
Mode (STBY, EN)
STBY 1
EN 0
and with V_IO > V_IO low threshold
(V_DD ON, INH)
(CAN, SPLIT)
(ERR)
if V_IO ON ⁽²⁾
STBY 0
EN 0
Local or CAN
wake-up
Standby (STBY 0, EN 0)
V_DD ON ⁽⁵⁾, INH ON
Terminated to ground, SPLIT HZ
ERR report: Wake-up
Power up
Power
Down
Notes
1. Coming from Standby mode
2. If V_I/O is still switched on
3. Coming from Normal mode
4. If batfail flag and wake-up flag are cleared. An attempt to enter Sleep mode without batfail and wake-up flag cleared has no effect
5. Limited current capability, to maintain the capacitor at V_DD charged.
6. A high level on INH will report a wake-up in Sleep mode
7. After 4 TXD pulses rising edge
Figure 8. State Diagram
Analog Integrated Circuit Device Data
Freescale Semiconductor
33902
13