參數(shù)資料
型號(hào)： L4969
廠商： 意法半導(dǎo)體
英文描述： SYSTEM VOLTAGE REGULATOR WITH FAULT TOLERANT LOW SPEED CAN-TRANSCEIVER
中文描述： 系統(tǒng)電壓調(diào)節(jié)器容錯(cuò)低速的CAN收發(fā)器
文件頁(yè)數(shù)： 14/35頁(yè)
文件大?。?/td> 337K
代理商： L4969
L4969
14/35
Figure 5.
1.6.3
When entering the sleep mode by writing 1 to DISAR in the VRCR register, the Voltageregulators and their re-
ferences will be deactivated to allow minimum current consumption. By removing the V1 reference, the output-
voltage is no longer supervised and thus NO reset will be generated.
Now two scenarios are possible (see statediagram in chapter 1.2):
1) Wakeup with V1 still above reset threshold: V1 will be reactivated and Normal mode is resumed
2) Wakeup with V1 below reset threshold: V1 will be activated, NRES will go low and remain low until V1 is
above reset threshold and Startup mode is entered.
The scenario 2 is the most critical when used with uC that do not have their own POR circuitry.
In this case V1 will ramp down with an unknown application state.
To guarantee a proper shut off of an uC without an internal POR circuitry the following mechanism can be uti-
lized: The L4969 uses a bidirectional Reset to detect a possible Watchdog failure of the uC. If this failure con-
dition is detected, NRES will be forced low for 1 ms (with activated timer) or until a wakeup condition occurs
(WDEN bit in WDC register reset, thus RC-oscillator will be switched off during sleep).
Two methods can be used to allow a proper sleep transition:
- With Timer (WDEN=1): immediately after setting DISAR the uC has to program its WDC to generate a failure
causing the L4969 to detect a low level on NRES followed by an automatic 1ms pulse extension. If V1 is ramping
down slow, Cext has to be defined in a way, that NRES will stay below the input threshold of the uC until V1 is
in a safe level.
- Without timer (WDEN=0): same procedure as above, but uC has to generate a Reset within 1 ms after WDEN
has been cleared. NRES will then stay low, until a wakeup condition occurs.
Reset signalling during Sleepmode
Figure 6.
.
1.7
A 12-Bit CAN-ID-filter is implemented allowing wakeup via specific CAN-messages thus aiding the implemen-
tation of low power partial communication networks like standby diagnostics without the need to power-up the
whole network.
To guarantee the detection of the programmed Identifiers, the local RC-oscillator can be calibrated to allow the
programmable Bittime logic to extract the incoming stream with a maximum of tolerance over temperature de-
viation.
Identifier Filter
1.8
Ground Shift Detection
1ms sampling
V1
UV
NRES
V1
NRES
C
EXT
DISAR
REF REG
1ms
RC-Osc
R1
R2
WDC
L4969
uC
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