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BQ79600-Q1 Fiches technique(PDF) 55 Page - Texas Instruments

No de pièce BQ79600-Q1
Description  BQ79600-Q1 Automotive SPI/UART Communication Interface Functional-Safety Compliant With Automatic Host Wakeup
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

BQ79600-Q1 Fiches technique(HTML) 55 Page - Texas Instruments

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8 Application and Implementation
Note
Information in the following applications sections is not part of the TI component specification, and TI
does not warrant its accuracy or completeness. TI’s customers are responsible for determining
suitability of components for their purposes. Customers should validate and test their design
implementation to confirm system functionality.
8.1 Application Information
This section is concerned with the external operation, what external components are required to add to the
device to make it usable in a particular design, and how to calculate the values for those external components.
8.2 Typical Applications
8.2.1 Bridge With Reverse Wakeup in UART
The following application circuit is used when user chooses to use UART interface and any of those features:
reverse wakeup, ring architecture, fault/heartbeat tone.
MCU
GPIO2
GPIO1
VIO
GND
BQ79600-Q1
VIO
GND
NFAULT
SBC
(PMIC)
KEY ON
5.5V-40V
3.3V/5V
Real Time Clock
CAN_WK
AFE fault
nCS
nUART/SPI (SPI_RDY)
SCLK
MOSI/RX
MISO/TX
GPIO3
GPIO4
GPIO5
GPIO0
0.1uF
100K
12V Battery
0.22uF
10K
100K
10K
DVDD
GND
CVDD
COMHP
COMHN
COMLP
COMLN
BAT
INH
Low
Voltage
Domain
How
Voltage
Domain
10
GND
50V 0.1uF
0.22uF
Twisted pair
cabling
100pF
100pF
1K
BQ battery
monitor
Cap/
Cap+choke/
XFMR
Isolation
1K
Cap/
Cap+choke/
XFMR
Isolation
BQ battery
monitor
100pF
100pF
100pF
100pF
Ratio:1 to 1
51
51
PESD5V0L2BT
51
51
PESD5V0L2BT
Figure 8-1. Typical Bridge with Reverse Wakeup in UART Applications Circuit
8.2.1.1 Design Requirements
Table 8-1 describes the design parameters.
Table 8-1. Recommended Design Requirement
PARAMETER
VALUE
UART speed
1Mbps
8.2.1.2 Detailed Design Procedure
8.2.1.2.1 MCU Interface (UART, NFAULT)
To select UART interface, connect nCS, nUART/SPI and SCLK pins to GND. UART interface includes RX/TX
pins. They are pulled up through a 10-100kΩ resistor to VIO like figure above.
NFAULT pin, if not used, connect to GND. Otherwise, pull it up wtih 100kΩ to VIO.
8.2.1.2.2 Daisy Chain Interface
Given that galvanic isolation is expected between BQ79600-Q1 and stack BQ devices, transformer isolation is
recommended. Section 8.2.1 shows the interface components values.
www.ti.com
BQ79600-Q1
SLUSDS1A – NOVEMBER 2019 – REVISED AUGUST 2020
Copyright © 2020 Texas Instruments Incorporated
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Product Folder Links: BQ79600-Q1


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