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| 型号： | MCP3421A5T-E/OT |
| 厂商： | Microchip Technology |
| 文件页数： | 9/30页 |
| 文件大小： | 0K |
| 描述： | IC ADC 18BIT 3.75SPS SOT23-6 |
| 标准包装： | 1 |
| 位数： | 18 |
| 采样率（每秒）： | 3.75 |
| 数据接口： | I²C，串行 |
| 转换器数目： | 1 |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-23-6 |
| 包装： | 标准包装 |
| 输入数目和类型： | 2 个单端，双极；1 个差分，单极 |
| 配用： | MCP3421EV-ND - BOARD EVAL FOR MCP3421 SOT23-6 |
| 其它名称： | MCP3421A5T-E/OTDKR |
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2006 Microchip Technology Inc.
DS22003B-page 17
MCP3421
5.5
High-Speed (HS) Mode
The I2C specification requires that a high-speed mode
device must be ‘activated’ to operate in high-speed
mode. This is done by sending a special address byte
of 00001XXX following the START bit. The XXX bits are
unique to the High-Speed (HS) mode Master. This byte
is referred to as the High-Speed (HS) Master Mode
Code (HSMMC). The MCP3421 device does not
acknowledge this byte. However, upon receiving this
code, the MCP3421 switches on its HS mode filters
and communicates up to 3.4 MHz on SDA and SCL.
The device will switch out of the HS mode on the next
STOP condition.
For more information on the HS mode, or other I2C
modes, please refer to the Phillips I2C specification.
5.6
I2C Bus Characteristics
The I2C specification defines the following bus
protocol:
Data transfer may be initiated only when the bus
is not busy.
During data transfer, the data line must remain
stable whenever the clock line is HIGH. Changes
in the data line while the clock line is HIGH will be
interpreted as a START or STOP condition.
Accordingly, the following bus conditions have been
defined using Figure 5-6.
5.6.1
BUS NOT BUSY (A)
Both data and clock lines remain HIGH.
5.6.2
START DATA TRANSFER (B)
A HIGH to LOW transition of the SDA line while the
clock (SCL) is HIGH determines a START condition. All
commands must be preceded by a START condition.
5.6.3
STOP DATA TRANSFER (C)
A LOW to HIGH transition of the SDA line while the
clock (SCL) is HIGH determines a STOP condition. All
operations can be ended with a STOP condition.
5.6.4
DATA VALID (D)
The state of the data line represents valid data when,
after a START condition, the data line is stable for the
duration of the HIGH period of the clock signal.
The data on the line must be changed during the LOW
period of the clock signal. There is one clock pulse per
bit of data.
Each data transfer is initiated with a START condition
and terminated with a STOP condition.
5.6.5
ACKNOWLEDGE
The Master (microcontroller) and the slave (MCP3421)
use an acknowledge pulse as a hand shake of
communication for each byte. The ninth clock pulse of
each byte is used for the acknowledgement. The
acknowledgement is achieved by pulling-down the
SDA line “LOW” during the 9th clock pulse. The clock
pulse is always provided by the Master (microcontrol-
ler) and the acknowledgement is issued by the
receiving device of the byte (Note: The transmitting
device must release the SDA line (“HIGH”) during the
acknowledge
pulse.).
For
example,
the
slave
(MCP3421) issues the acknowledgement (bring down
the SDA line “LOW”) after the end of each receiving
byte, and the master (microcontroller) issues the
acknowledgement when it reads data from the Slave
(MCP3421).
When the MCP3421 is addressed, it generates an
acknowledge after receiving each byte successfully.
The Master device (microcontroller) must provide an
extra clock pulse (9th pulse of each byte) for the
acknowledgement from the MCP3421 (slave).
The MCP3421 (slave) pulls-down the SDA line during
the acknowledge clock pulse in such a way that the
SDA line is stable low during the high period of the
acknowledge clock pulse.
During reads, the Master (microcontroller) can
terminate the current read operation by not providing
an acknowledge bit on the last byte that has been
clocked out from the MCP3421. In this case, the
MCP3421 releases the SDA line to allow the master
(microcontroller) to generate a STOP or repeated
START condition.
FIGURE 5-6:
Data Transfer Sequence on the Serial Bus.
SCL
SDA
(A)
(B)
(D)
(A)
(C)
START
CONDITION
ADDRESS OR
ACKNOWLEDGE
VALID
DATA
ALLOWED
TO CHANGE
STOP
CONDITION
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