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L99LD02 bảng dữ liệu(PDF) 58 Page - STMicroelectronics

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L99LD02 bảng dữ liệu(HTML) 58 Page - STMicroelectronics

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Electrical specifications
L99LD02
58/66
DS12448 Rev 3
6.4.3
System Oscillator and Digital Timings
Digital timings guaranteed by scan. WD and auto-restart timings limits added to give
indication on application cases.
6.4.4
SPI bus (CSN, SCK, SDI, SDO)
Table 38. Digital timings description
Symbol
Parameter
Test conditions
Min
Typ
Max
Unit
tWD
Watchdog timeout period
45
50
55
ms
tCSN_TIMEOUT
CSN timeout
90
115
140
ms
tAUTORESTART
Autorestart time in Limp Home
mode
45
50
55
ms
tVS,UV
VS undervoltage filter time
32
µs
tVDD_FT
VDD Filtering Time
32
µs
tWAKEUP
Time for a complete wake up
(V3V3 > VPOR_L)
CSN low for t > tWAKEUP
Cap on V3V3 = 1µF
V3V3 > 3V
129
µs
tSTDBY
Time needed for a transition to
standby mode (V3V3 < VPOR_L)
CSN high for t > tSTDBY
Cap on V3V3 = 1µF
V3V3 < 2.5V
1ms
tOVT
Filtering time for overtemperature
(OVT bit will be set if Tj > TTSD for
more than tOVT)
1.2
µs
tBST_OVP
BST_OVP flag set filtering time
32
µs
tBST_OVP_RST
BST_OVP flag reset filtering time
10
ms
tBOOST_OUT_FAIL
BST_OUT_FAIL flag set filtering
time
1.6
µs
tTM_LOW
Time needed for a transition to pre-
standby mode (V3V3 > VPOR_L)
200
µs
Table 39. CSN, SCK, SDI input
Symbol
Parameter
Test conditions
Min
Typ
Max
Unit
VIN_L
Input voltage low threshold
0.3 * V3V3
V
VIN_H
Input voltage high threshold
0.7 * V3V3
V3V3
V
IIN_L, SDI,SCK
Low level input current
VIN = 0.3 * V3V3
1µA
IIN_L, CSN
-10
µA
IIN_H, SDI,SCK
High level input current
VIN = 0.7 * V3V3
10
µA
IIN_H, CSN
-1
µA



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