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L99DZ320 Datasheet(PDF) 47 Page - STMicroelectronics

Part # L99DZ320
Description  Automotive rear door device with CAN FD and LIN
PDF  146 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L99DZ320 Datasheet(HTML) 47 Page - STMicroelectronics

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Bits FORCED_SLEEP_TSD2_V1SC (SR8) and V1FAIL (SR7) are set.
In the case of a V2 short to GND failure, the V2SC (SR7) and V1FAIL (SR7) bits are set.
Once the output voltage of the corresponding regulator V1 (V2) has exceeded the V1fail (V2fail) threshold, the
short to ground detection is disabled. In case of a short to ground condition, the regulator is switched off due to
thermal shutdown. V1 is switched off at TSD2, V2 is switched off at TSD1.
3.2.5
Voltage regulator behavior
Figure 15. Voltage regulator behavior and diagnosis during supply voltage ramp-up/ramp-down
conditions
Vsreg [ V ]
V1 [ V ]
Nreset
output
VPOR
VRTH
High
Low
V1fail
If t > tv1short
V1 short detected
è VBAT_standby
t > tV1fail
V1FAIL bit is set
t < tUV1
trr
trr
t > tUV1
No Reset generated
t > tUV1
RD
tRD
VSregUV
tV1FS
V1
specific Control Registers are set to default values
High Z Grounded
VSregUV:
Vsreg under-voltage
VPOR_R/F:
Vsreg power-on reset voltage
(rising/falling)
VRTx:
V1 reset threshold voltage
V1FAIL:
V1 fail threshold voltage
tUV1:
V1 under-voltage filter time
tV1fail:
V1 fail filter time
trr:
reset pulse reaction time
tRD
reset pulse duration
tV1short:
V1 short filter time
tV1FS:
V1 fail safe filter time
tOVUV_filt:
Vsreg over-/undervoltage filter time
Control
Registers
set to default
at VPOR_F
If t1 >tV1FS
t1
100us
t
RSTB bit is set and registers
(filter time tOVUV_filt )
VSREGUV bit is set
are set to default at VPOR_R
L99DZ320
Functional description
DS14235 - Rev 5
page 47/146



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