51单片机逆向学习实战视频教程（2）资源-CSDN文库

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51单片机

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51单片机逆向学习实战视频教程（2）（472个子文件）

10HZ_SEG 10KB

10HZ_ZHENGXIAN 8KB

10HZ_ZHENGXIAN02 8KB

1602_str 7KB

KEDY_INT_TRIG.__i 52B

STARTUP.A51 6KB

PCF8591_LED.uvgui.admin 70KB

SIN_CON.uvgui.Administrator 137KB

PCF8591_OUT.uvgui.Administrator 137KB

10HZ_ZHENGXIAN02.uvgui.Administrator 137KB

WAVE_ALL.uvgui.Administrator 137KB

DS18B20_UART.uvgui.Administrator 136KB

1602_str.uvgui.Administrator 136KB

KEY_SEG.uvgui.Administrator 136KB

PCF8591_LED_02.uvgui.Administrator 70KB

10HZ_ZHENGXIAN.uvgui.Administrator 70KB

WAVE_ZHIZHEN.uvgui.Administrator 70KB

PINLV_TEST.uvgui.Administrator 70KB

10HZ_SEG.uvgui.Administrator 70KB

UART_ADC.uvgui.Administrator 70KB

PCF8591_LED.uvgui.Administrator 70KB

UART_STR.uvgui.Administrator 70KB

HONGWAI.uvgui.Administrator 70KB

UART_HELLO.uvgui.Administrator 70KB

UART_LED.uvgui.Administrator 70KB

KEY_INT_TRIG.uvgui.Administrator 70KB

KEY_COUNT.uvgui.Administrator 70KB

KEY_INT_LEVEL.uvgui.Administrator 70KB

SIN_CON.uvgui_Administrator.bak 137KB

PCF8591_OUT.uvgui_Administrator.bak 137KB

10HZ_ZHENGXIAN02.uvgui_Administrator.bak 137KB

WAVE_ALL.uvgui_Administrator.bak 137KB

DS18B20_UART.uvgui_Administrator.bak 136KB

KEY_SEG.uvgui_Administrator.bak 136KB

1602_str.uvgui_Administrator.bak 136KB

PCF8591_LED_02.uvgui_Administrator.bak 70KB

10HZ_ZHENGXIAN.uvgui_Administrator.bak 70KB

WAVE_ZHIZHEN.uvgui_Administrator.bak 70KB

PINLV_TEST.uvgui_Administrator.bak 70KB

10HZ_SEG.uvgui_Administrator.bak 70KB

UART_ADC.uvgui_Administrator.bak 70KB

HONGWAI.uvgui_Administrator.bak 70KB

PCF8591_LED.uvgui_Administrator.bak 70KB

UART_HELLO.uvgui_Administrator.bak 70KB

UART_LED.uvgui_Administrator.bak 70KB

UART_STR.uvgui_Administrator.bak 70KB

KEY_INT_TRIG.uvgui_Administrator.bak 70KB

KEY_INT_LEVEL.uvgui_Administrator.bak 70KB

KEY_COUNT.uvgui_Administrator.bak 70KB

SIN_CON_uvopt.bak 56KB

10HZ_SEG_uvopt.bak 56KB

10HZ_ZHENGXIAN_uvopt.bak 56KB

HONGWAI_uvopt.bak 55KB

10HZ_ZHENGXIAN02_uvopt.bak 55KB

PCF8591_LED_02_uvopt.bak 55KB

WAVE_ZHIZHEN_uvopt.bak 55KB

PCF8591_LED_uvopt.bak 55KB

UART_ADC_uvopt.bak 55KB

PINLV_TEST_uvopt.bak 55KB

WAVE_ALL_uvopt.bak 55KB

PCF8591_OUT_uvopt.bak 55KB

DS18B20_UART_uvopt.bak 54KB

KEY_INT_LEVEL_uvopt.bak 54KB

KEY_INT_TRIG_uvopt.bak 54KB

UART_HELLO_uvopt.bak 54KB

KEY_COUNT_uvopt.bak 54KB

1602_str_uvopt.bak 54KB

UART_LED_uvopt.bak 54KB

UART_STR_uvopt.bak 54KB

KEY_SEG_uvopt.bak 54KB

时序_uvopt.bak 54KB

10HZ_ZHENGXIAN02_uvproj.bak 13KB

PCF8591_LED_02_uvproj.bak 13KB

10HZ_ZHENGXIAN_uvproj.bak 13KB

WAVE_ZHIZHEN_uvproj.bak 13KB

PINLV_TEST_uvproj.bak 13KB

UART_ADC_uvproj.bak 13KB

WAVE_ALL_uvproj.bak 13KB

10HZ_SEG_uvproj.bak 13KB

共 472 条

1 of 20 050102

FEATURES

§ Unique 1-Wire

interface requires only one

port pin for communication

§ Each device has a unique 64-bit serial code

stored in an onboard ROM

§ Multidrop capability simplifies distributed

temperature sensing applications

§ Requires no external components

§ Can be powered from data line. Power supply

range is 3.0V to 5.5V

§ Measures temperatures from –55°C to

+125°C (–67°F to +257°F)

§ ±0.5°C accuracy from –10°C to +85°C

§ Thermometer resolution is user-selectable

from 9 to 12 bits

§ Converts temperature to 12-bit digital word in

750ms (max.)

§ User-definable nonvolatile (NV) alarm

settings

§ Alarm search command identifies and

addresses devices whose temperature is

outside of programmed limits (temperature

alarm condition)

§ Available in 8-pin SO (150mil), 8-pin mSOP,

and 3-pin TO-92 packages

§ Software compatible with the DS1822

§ Applications include thermostatic controls,

industrial systems, consumer products,

thermometers, or any thermally sensitive

system

PIN ASSIGNMENT

PIN DESCRIPTION

GND - Ground

DQ - Data In/Out

- Power Supply Voltage

NC - No Connect

DESCRIPTION

The DS18B20 Digital Thermometer provides 9 to 12–bit centigrade temperature measurements and has

an alarm function with nonvolatile user-programmable upper and lower trigger points. The DS18B20

communicates over a 1-Wire bus that by definition requires only one data line (and ground) for

communication with a central microprocessor. It has an operating temperature range of –55°C to +125°C

and is accurate to ±0.5°C over the range of –10°C to +85°C. In addition, the DS18B20 can derive power

directly from the data line (“parasite power”), eliminating the need for an external power supply.

Each DS18B20 has a unique 64-bit serial code, which allows multiple DS18B20s to function on the same

1–wire bus; thus, it is simple to use one microprocessor to control many DS18B20s distributed over a

large area. Applications that can benefit from this feature include HVAC environmental controls,

temperature monitoring systems inside buildings, equipment or machinery, and process monitoring and

control systems.

DS18B20

Programmable Resolution

1-Wire Digital Thermometer

www.

maxim

.com

8-Pin 150mil SO

(DS18B20Z)

TO-92

(

DS18B20

)

(

BOTTOM VIEW

)

DALLAS

18B20

GND

DALLAS

18B20

GND

18B20

8-Pin

SOP

(

DS18B20U

)

1-Wire is a registered trademark of Dallas Semiconductor.

DS18B20

2 of 20

DETAILED PIN DESCRIPTIONS Table 1

SO*

mSOP*

TO-92 SYMBOL DESCRIPTION

5 4 1 GND

Ground.

412DQData Input/Output pin. Open-drain 1-Wire interface pin.

Also provides power to the device when used in parasite

power mode (see “Parasite Power” section.)

383V

Optional V

pin. V

must be grounded for operation in

parasite power mode.

*All pins not specified in this table are “No Connect” pins.

OVERVIEW

Figure 1 shows a block diagram of the DS18B20, and pin descriptions are given in Table 1. The 64-bit

ROM stores the device’s unique serial code. The scratchpad memory contains the 2-byte temperature

access to the 1-byte upper and lower alarm trigger registers (T

and T

), and the 1-byte configuration

conversion to 9, 10, 11, or 12 bits. The T

, T

and configuration

registers are nonvolatile (EEPROM), so

they will retain data when the device is powered down.

The DS18B20 uses Dallas’ exclusive 1-Wire bus protocol that implements bus communication using one

control signal. The control line requires a weak pullup resistor since all devices are linked to the bus via a

3-state or open-drain port (the DQ pin in the case of the DS18B20). In this bus system, the

microprocessor (the master device) identifies and addresses devices on the bus using each device’s unique

64-bit code. Because each device has a unique code, the number of devices that can be addressed on one

bus is virtually unlimited. The 1-Wire bus protocol, including detailed explanations of the commands and

“time slots,” is covered in the 1-WIRE BUS SYSTEM section of this datasheet.

Another feature of the DS18B20 is the ability to operate without an external power supply. Power is

instead supplied through the 1-Wire pullup resistor via the DQ pin when the bus is high. The high bus

signal also charges an internal capacitor (C

), which then supplies power to the device when the bus is

low. This method of deriving power from the 1-Wire bus is referred to as “parasite power.” As an

alternative, the DS18B20 may also be powered by an external supply on V

DS18B20 BLOCK DIAGRAM Figure 1

4.7k

POWER

SUPPLY

SENSE

64-BIT ROM

AND

1-wire PORT

INTERNAL V

PARASITE POWER

CIRCUIT

MEMORY CONTROL

LOGIC

SCRATCHPAD

8-BIT CRC GENERATOR

TEMPERATURE SENSOR

ALARM HIGH TRIGGER (T

)

ALARM LOW TRIGGER (T

)

CONFIGURATION REGISTER

(EEPROM)

GND

DS18B20

3 of 20

OPERATION — MEASURING TEMPERATURE

The core functionality of the DS18B20 is its direct-to-digital temperature sensor. The resolution of the

temperature sensor is user-configurable to 9, 10, 11, or 12 bits, corresponding to increments of 0.5°C,

0.25°C, 0.125°C, and 0.0625°C, respectively. The default resolution at power-up is 12-bit. The DS18B20

powers-up in a low-power idle state; to initiate a temperature measurement and A-to-D conversion, the

master must issue a Convert T [44h] command. Following the conversion, the resulting thermal data is

stored in the 2-byte temperature register in the scratchpad memory and the DS18B20 returns to its idle

state. If the DS18B20 is powered by an external supply, the master can issue “read time slots” (see the 1-

WIRE BUS SYSTEM section) after the Convert T command and the DS18B20 will respond by

transmitting 0 while the temperature conversion is in progress and 1 when the conversion is done. If the

DS18B20 is powered with parasite power, this notification technique cannot be used since the bus must

be pulled high by a strong pullup during the entire temperature conversion. The bus requirements for

parasite power are explained in detail in the POWERING THE DS18B20 section of this datasheet.

The DS18B20 output temperature data is calibrated in degrees centigrade; for Fahrenheit applications, a

lookup table or conversion routine must be used. The temperature data is stored as a 16-bit sign-extended

two’s complement number in the temperature register (see Figure 2). The sign bits (S) indicate if the

temperature is positive or negative: for positive numbers S = 0 and for negative numbers S = 1. If the

DS18B20 is configured for 12-bit resolution, all bits in the temperature register will contain valid data.

For 11-bit resolution, bit 0 is undefined. For 10-bit resolution, bits 1 and 0 are undefined, and for 9-bit

resolution bits 2, 1 and 0 are undefined. Table 2 gives examples of digital output data and the

corresponding temperature reading for 12-bit resolution conversions.

TEMPERATURE REGISTER FORMAT Figure 2

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

LS Byte

-1

-2

-3

-4

bit 15 bit 14 bit 13 bit 12 bit 11 bit 10 bit 9 bit 8

MS Byte

SSSSS2

TEMPERATURE/DATA RELATIONSHIP Table 2

TEMPERATURE DIGITAL OUTPUT

(Binary)

DIGITAL OUTPUT

(Hex)

+125°C 0000 0111 1101 0000 07D0h

+85°C* 0000 0101 0101 0000 0550h

+25.0625°C 0000 0001 1001 0001 0191h

+10.125°C 0000 0000 1010 0010 00A2h

+0.5°C 0000 0000 0000 1000 0008h

0°C 0000 0000 0000 0000 0000h

-0.5°C 1111 1111 1111 1000 FFF8h

-10.125°C 1111 1111 0101 1110 FF5Eh

-25.0625°C 1111 1110 0110 1111 FE6Fh

-55°C 1111 1100 1001 0000 FC90h

*The power-on reset value of the temperature register is +85°C

DS18B20

4 of 20

OPERATION — ALARM SIGNALING

After the DS18B20 performs a temperature conversion, the temperature value is compared to the user-

defined two’s complement alarm trigger values stored in the 1-byte T

and T

registers (see Figure 3).

The sign bit (S)

indicates if the value is positive or negative: for positive numbers S = 0 and for negative

numbers S = 1. The T

and T

registers are nonvolatile (EEPROM) so they will retain data when the

device is powered down. T

and T

can be accessed through bytes 2 and 3 of the scratchpad as explained

in the MEMORY section of this datasheet.

AND T

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

Only bits 11 through 4 of the temperature register are used in the T

and T

comparison since T

and T

are 8-bit registers. If the measured temperature is lower than or equal to T

or higher than T

, an alarm

condition exists and an alarm flag is set inside the DS18B20. This flag is updated after every temperature

measurement; therefore, if the alarm condition goes away, the flag will be turned off after the next

temperature conversion.

The master device can check the alarm flag status of all DS18B20s on the bus by issuing an Alarm Search

[ECh] command. Any DS18B20s with a set alarm flag will respond to the command, so the master can

determine exactly which DS18B20s have experienced an alarm condition. If an alarm condition exists

and the T

or T

settings have changed, another temperature conversion should be done to validate the

alarm condition.

POWERING THE DS18B20

The DS18B20 can be powered by an external supply on the V

pin, or it can operate in “parasite power”

mode, which allows the DS18B20 to function without a local external supply. Parasite power is very

useful for applications that require remote temperature sensing or that are very space constrained. Figure

1 shows the DS18B20’s parasite-power control circuitry, which “steals” power from the 1-Wire bus via

the DQ pin when the bus is high. The stolen charge powers the DS18B20 while the bus is high, and some

of the charge is stored on the parasite power capacitor (C

) to provide power when the bus is low. When

the DS18B20 is used in parasite power mode, the V

pin must be connected to ground.

In parasite power mode, the 1-Wire bus and C

can provide sufficient current to the DS18B20 for most

operations as long as the specified timing and voltage requirements are met (refer to the DC

ELECTRICAL CHARACTERISTICS and the AC ELECTRICAL CHARACTERISTICS sections of this data

sheet). However, when the DS18B20 is performing temperature conversions or copying data from the

scratchpad memory to EEPROM, the operating current can be as high as 1.5mA. This current can cause

an unacceptable voltage drop across the weak 1-Wire pullup resistor and is more current than can be

supplied by C

. To assure that the DS18B20 has sufficient supply current, it is necessary to provide a

strong pullup on the 1-Wire bus whenever temperature conversions are taking place or data is being

copied from the scratchpad to EEPROM. This can be accomplished by using a MOSFET to pull the bus

directly to the rail as shown in Figure 4. The 1-Wire bus must be switched to the strong pullup within

10ms (max) after a Convert T [44h] or Copy Scratchpad [48h] command is issued, and the bus must be

held high by the pullup for the duration of the conversion (t

conv

) or data transfer (t

= 10ms). No other

activity can take place on the 1-Wire bus while the pullup is enabled.

The DS18B20 can also be powered by the conventional method of connecting an external power supply

to the V

pin, as shown in Figure 5. The advantage of this method is that the MOSFET pullup is not

required, and the 1-Wire bus is free to carry other traffic during the temperature conversion time.

DS18B20

5 of 20

The use of parasite power is not recommended for temperatures above +100°C since the DS18B20 may

not be able to sustain communications due to the higher leakage currents that can exist at these

temperatures. For applications in which such temperatures are likely, it is strongly recommended that the

DS18B20 be powered by an external power supply.

In some situations the bus master may not know whether the DS18B20s on the bus are parasite powered

or powered by external supplies. The master needs this information to determine if the strong bus pullup

should be used during temperature conversions. To get this information, the master can issue a Skip ROM

[CCh] command followed by a Read Power Supply [B4h] command followed by a “read time slot”.

During the read time slot, parasite powered DS18B20s will pull the bus low, and externally powered

DS18B20s will let the bus remain high. If the bus is pulled low, the master knows that it must supply the

strong pullup on the 1-Wire bus during temperature conversions.

SUPPLYING THE PARASITE-POWERED DS18B20 DURING TEMPERATURE

CONVERSIONS Figure 4

POWERING THE DS18B20 WITH AN EXTERNAL SUPPLY Figure 5

64-BIT LASERED ROM CODE

Each DS18B20 contains a unique 64–bit code (see Figure 6) stored in ROM. The least significant 8 bits

of the ROM code contain the DS18B20’s 1-Wire family code: 28h. The next 48 bits contain a unique

serial number. The most significant 8 bits contain a cyclic redundancy check (CRC) byte that is

calculated from the first 56 bits of the ROM code. A detailed explanation of the CRC bits is provided in

the CRC GENERATION section. The 64-bit ROM code and associated ROM function control logic allow

the DS18B20 to operate as a 1-Wire device using the protocol detailed in the 1-WIRE BUS SYSTEM

section of this datasheet.

64-BIT LASERED ROM CODE Figure 6

8-BIT CRC 48-BIT SERIAL NUMBER 8-BIT FAMILY CODE (28h)

MSB MSBLSB LSB LSBMSB

(External Supply)

DS18B20

GND

4.7k

To Other

1-Wire Devices

1-Wire Bus

Micro-

processor

4.7k

1-Wire Bus

Micro-

processor

DS18B20

GND

To Other

1-Wire Devices

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