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首页华邦w25q256系列flash指导手册
华邦w25q256系列flash指导手册
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更新于2023-03-03
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华邦w25q256系列flash指导手册,包括了功能介绍,推荐电路,通讯命令等等。我在使用过程中,没有在片选信号上加上拉,实际使用的时候出现了flash中文件丢失的现象。因为是偶发的,没能准确找到原因,最终又加上了上拉电阻,后来就没出现问题。 还有一个要注意的,是三线制四线制的问题,32M的flash 需要用四线制。
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1. General description
The TJA1042 is a high-speed CAN transceiver that provides an interface between a
Controller Area Network (CAN) protocol controller and the physical two-wire CAN bus.
The transceiver is designed for high-speed (up to 1 Mbit/s) CAN applications in the
automotive industry, providing the differential transmit and receive capability to (a
microcontroller with) a CAN protocol controller.
The TJA1042 is a step up from the TJA1040, PCA82C250 and PCA82C251 high-speed
CAN transceivers. It offers improved ElectroMagnetic Compatibility (EMC) and
ElectroStatic Discharge (ESD) performance, and also features:
• Ideal passive behavior to the CAN bus when the supply voltage is off
• A very low-current Standby mode with bus wake-up capability
• Direct interfacing to microcontrollers with 3 V to 5 V supply voltages on TJA1042T/3
and TJA1042TK/3
These features make the TJA1042 an excellent choice for all types of HS-CAN networks,
in nodes that require a low-power mode with wake-up capability via the CAN bus.
2. Features
2.1 General
n Fully ISO 11898-2 and ISO 11898-5 compliant
n Suitable for 12 V and 24 V systems
n Low ElectroMagnetic Emission (EME) and high ElectroMagnetic Immunity (EMI)
n V
IO
input on TJA1042T/3 and TJA1042TK/3 allows for direct interfacing with 3 V to 5 V
microcontrollers (available in SO8 and very small HVSON8 packages respectively)
n SPLIT voltage output on TJA1042T for stabilizing the recessive bus level (available in
SO8 package only)
2.2 Low-power management
n Very low-current Standby mode with host and bus wake-up capability
n Functional behavior predictable under all supply conditions
n Transceiver disengages from the bus when not powered up (zero load)
2.3 Protections
n High ESD handling capability on the bus pins
n Bus pins protected against transients in automotive environments
TJA1042
High-speed CAN transceiver with Standby mode
Rev. 02 — 8 July 2009 Product data sheet
TJA1042_2 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 02 — 8 July 2009 2 of 20
NXP Semiconductors
TJA1042
High-speed CAN transceiver with Standby mode
n Transmit Data (TXD) dominant time-out function
n Bus-dominant time-out function in Standby mode
n Undervoltage detection on pins V
CC
and V
IO
n Thermally protected
3. Ordering information
[1] TJA1042T with SPLIT pin; TJA1042T/3 and TJA1042TK/3 with V
IO
pin.
Table 1. Ordering information
Type number
[1]
Package
Name Description Version
TJA1042T SO8 plastic small outline package; 8 leads; body width 3.9 mm SOT96
TJA1042T/3 SO8 plastic small outline package; 8 leads; body width 3.9 mm SOT96
TJA1042TK/3 HVSON8 plastic thermal enhanced very small outline package; 8 leads; body
width 3 mm; lead pitch 0.65 mm; exposed die pad
SOT782
TJA1042_2 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 02 — 8 July 2009 3 of 20
NXP Semiconductors
TJA1042
High-speed CAN transceiver with Standby mode
4. Block diagram
(1) In a transceiver with a SPLIT pin, the V
IO
input is internally connected to V
CC
.
Fig 1. Block diagram
TEMPERATURE
PROTECTION
TIME-OUT
MODE
CONTROL
MUX
AND
DRIVER
TXD
1
V
IO
(1)
RXD
4
SLOPE
CONTROL
AND
DRIVER
V
CC
CANH
CANL
7
6
V
CC
V
IO
53
2
GND
TJA1042
STB
8
V
IO
(1)
SPLIT
SPLIT
(1)
5
WAKE-UP
FILTER
015aaa017
TJA1042_2 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 02 — 8 July 2009 4 of 20
NXP Semiconductors
TJA1042
High-speed CAN transceiver with Standby mode
5. Pinning information
5.1 Pinning
5.2 Pin description
Fig 2. Pin configuration diagrams
TJA1042T
TXD STB
GND CANH
V
CC
CANL
RXD SPLIT
1
2
3
4
6
5
8
7
015aaa018
TJA1042T/3
TJA1042TK/3
TXD STB
GND CANH
V
CC
CANL
RXD V
IO
1
2
3
4
6
5
8
7
015aaa019
Table 2. Pin description
Symbol Pin Description
TXD 1 transmit data input
GND 2 ground supply
V
CC
3 supply voltage
RXD 4 receive data output; reads out data from the bus lines
SPLIT 5 common-mode stabilization output; in TJA1042T version only
V
IO
5 supply voltage for I/O level adapter; in TJA1042T/3 and TJA1042TK/3 versions
only
CANL 6 LOW-level CAN bus line
CANH 7 HIGH-level CAN bus line
STB 8 Standby mode control input
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