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參數(shù)資料
| 型號： | MCP23S08T-E/SO |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 41/44頁 |
| 文件大小： | 0K |
| 描述： | IC I/O EXPANDER SPI 8B 18SOIC |
| 標(biāo)準(zhǔn)包裝： | 1,100 |
| 接口： | SPI |
| 輸入/輸出數(shù)： | 8 |
| 中斷輸出： | 是 |
| 頻率 - 時鐘： | 10MHz |
| 電源電壓： | 1.8 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 18-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 18-SOIC |
| 包裝： | 帶卷 (TR) |
| 包括： | POR |
| 配用： | GPIODM-KPLCD-ND - BOARD DEMO LCD GPIO EXP KEYPAD |
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MCP23008/MCP23S08
DS21919E-page 6
2007 Microchip Technology Inc.
1.2
Power-on Reset (POR)
The on-chip POR circuit holds the device in reset until
VDD has reached a high enough voltage to deactivate
the POR circuit (i.e., release the device from Reset).
When the device exits the POR condition (releases
reset), device operating parameters (i.e., voltage,
temperature, serial bus frequency, etc.) must be met to
ensure proper operation.
1.3
Serial Interface
This block handles the functionality of the I2C
(MCP23008) or SPI (MCP23S08) interface protocol.
The MCP23X08 contains eleven registers that can be
addressed through the serial interface block (Table 1-2):
TABLE 1-2:
REGISTER ADDRESSES
1.3.1
SEQUENTIAL OPERATION BIT
The Sequential Operation (SEQOP) bit (IOCON
register) controls the operation of the address pointer.
The address pointer can either be enabled (default) to
allow the address pointer to increment automatically
after each data transfer, or it can be disabled.
When
operating
in
Sequential
mode
(IOCON.SEQOP = 0), the address pointer automati-
cally increments to the next address after each byte
is clocked.
When operating in Byte mode (IOCON.SEQOP = 1),
the MCP23X08 does not increment its address
counter after each byte during the data transfer. This
gives the ability to continually read the same address
by providing extra clocks (without additional control
bytes). This is useful for polling the GPIO register for
data changes.
1.3.2
I2C INTERFACE
1.3.2.1
I2C Write Operation
The I2C Write operation includes the control byte and
register address sequence, as shown in the bottom of
Figure 1-1. This sequence is followed by eight bits of
data from the master and an Acknowledge (ACK) from
the MCP23008. The operation is ended with a STOP
or RESTART condition being generated by the master.
Data is written to the MCP23008 after every byte
transfer. If a STOP or RESTART condition is
generated during a data transfer, the data will not be
written to the MCP23008.
Byte writes and sequential writes are both supported
by the MCP23008. The MCP23008 increments its
address counter after each ACK during the data
transfer.
1.3.2.2
I2C Read Operation
The I2C Read operation includes the control byte
sequence, as shown in the bottom of Figure 1-1. This
sequence is followed by another control byte (includ-
ing the START condition and ACK) with the R/W bit
equal to a logic 1 (R/W = 1). The MCP23008 then
transmits the data contained in the addressed register.
The sequence is ended with the master generating a
STOP or RESTART condition.
1.3.2.3
I2C Sequential Write/Read
For sequential operations (Write or Read), instead of
transmitting a STOP or RESTART condition after the
data transfer, the master clocks the next byte pointed to
by the address pointer (see Section 1.3.1 “Sequential
Operation Bit” for details regarding sequential
operation control).
The sequence ends with the master sending a STOP or
RESTART condition.
The MCP23008 address pointer will roll over to
address zero after reaching the last register address.
Refer to Figure 1-1.
1.3.3
SPI INTERFACE
1.3.3.1
SPI Write Operation
The SPI Write operation is started by lowering CS. The
Write command (slave address with R/W bit cleared) is
then clocked into the device. The opcode is followed by
an address and at least one data byte.
1.3.3.2
SPI Read Operation
The SPI Read operation is started by lowering CS. The
SPI read command (slave address with R/W bit set) is
then clocked into the device. The opcode is followed by
an address, with at least one data byte being clocked
out of the device.
Address
Access to:
00h
IODIR
01h
IPOL
02h
GPINTEN
03h
DEFVAL
04h
INTCON
05h
IOCON
06h
GPPU
07h
INTF
08h
INTCAP (Read-only)
09h
GPIO
0Ah
OLAT
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