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TPIC1021AQDRQ1 Scheda tecnica(PDF) 5 Page - Texas Instruments

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Il numero della parte TPIC1021AQDRQ1
Spiegazioni elettronici  LIN PHYSICAL INTERFACE
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TPIC1021AQDRQ1 Scheda tecnica(HTML) 5 Page - Texas Instruments

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OPERATING STATES
Unpowered System
V
V
sup
sup_under
£
Standby Mode
Driver : Off
RXD: Low
INH: High (On)
Termination: 30 kW
EN = high
EN = low
EN = high
LIN Bus Wake-Up
or
Nwake Pin Wake-Up
V
> V
EN = low
sup
sup_under
V
V
sup
sup_under
£
V
V
sup
sup_under
£
V
V
sup
sup_under
£
V
> V
EN = high
sup
sup_under
Sleep Mode
Driver : Off
RXD: Floating
INH: High impedance (Off)
Termination: Weak pullup
Normal Mode
Driver : On
RXD: LIN bus data
INH: High (On)
Termination: 30 kW
Normal Mode
Sleep Mode
TPIC1021A-Q1
www.ti.com.......................................................................................................................................................... SLIS117A – AUGUST 2007 – REVISED JUNE 2009
Figure 1. Operating States Diagram
Table 1. Operating Modes
LIN BUS
MODE
EN
RXD
INH
TRANSMITTER
COMMENTS
TERMINATION
Sleep
Low
Floating
Weak current pullup
High impedance
Off
Wake-up event detected, waiting
Standby
Low
Low
30 k
Ω (typ)
High
Off
on MCU to set EN
Normal
High
LIN bus data
30 k
Ω (typ)
High
On
LIN transmission up to 20 kbps
This is the normal operational mode, in which the receiver and driver are active, and LIN transmission up to the
LIN specified maximum of 20 kbps is supported. The receiver detects the data stream on the LIN bus and
outputs it on RXD for the LIN controller, where recessive on the LIN bus is a digital high, and dominate on the
LIN bus is digital low. The driver transmits input data on TXD to the LIN bus. Normal mode is entered as EN
transitions high while the TPIC1021A is in sleep or standby mode.
Sleep mode is the power saving mode for the TPIC1021A and the default state after power up (assuming EN is
low during power up). Even with the extremely low current consumption in this mode, the TPIC1021A can still
wake up from LIN bus via a wake-up signal, a low on NWake, or if EN is set high. The LIN bus and NWake are
filtered to prevent false wake-up events. The wake-up events must be active for their respective time periods
(tLINBUS, tNWake).
The sleep mode is entered by setting EN low.
Copyright © 2007–2009, Texas Instruments Incorporated
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