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| 型号： | MCP2030-I/ST |
| 厂商： | Microchip Technology |
| 文件页数： | 50/66页 |
| 文件大小： | 0K |
| 描述： | IC KEYLESS ENTRY AFE 14TSSOP |
| 标准包装： | 96 |
| RF 型： | ISM |
| 频率： | 125kHz |
| 特点： | 10kbps |
| 封装/外壳： | 14-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 14-TSSOP |
| 包装： | 管件 |
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MCP2030
CS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
SCLK
SDIO
MSb
LSb
Command
Address
Data Byte
Row
Parity Bit
FIGURE 5-12:
Detailed SPI Timing (AFE).
5.31.2.1
Clamp On Command
5.31.2.5
AGC Preserve On Command
This command results in activating (turning on) the
modulation transistors of all enabled channels; channels
enabled in Configuration Register 0 (Register 5-1).
This command results in preserving the AGC level
during each AGC initialization time and apply the value
to the data slicing circuit for the following data stream.
The preserved AGC value is reset by a Soft Reset, and
5.31.2.2
Clamp Off Command
a new AGC value is acquired and preserved when it
This command results in deactivating (turning off) the
modulation transistors of all channels.
5.31.2.3 Sleep Command
This command places the device in Sleep mode –
minimizing current draw by disabling all but the
essential circuitry. Any other command wakes the
device from Sleep (e.g., Clamp Off command).
starts a new AGC initialization time. This feature is
disabled by an AGC Preserve Off command (see
Section 5.19 “AGC Preserve” ).
5.31.2.6 AGC Preserve Off Command
This command disables the AGC preserve feature and
returns to the normal AGC tracking mode, fast tracking
during AGC settling time and slow tracking after that
(see Section 5.19 “AGC Preserve” ).
5.31.2.4 Soft Reset Command
The device issues a Soft Reset when it receives an
external Soft Reset command. The external Soft Reset
5.31.3
READ/WRITE COMMANDS FOR
CONFIGURATION REGISTERS
command is typically used to end a SPI communication
sequence or to initialize the device for the next signal
detection sequence, etc. See Section 5.20 “Soft
Reset” for more details on Soft Reset.
If a Soft Reset command is sent during a “Clamp-on”
condition, the device still keeps the “Clamp-on” condi-
tion after the Soft Reset execution. The Soft Reset is
executed in Active mode only, not in Standby mode.
The SPI Soft Reset command is ignored if the device is
not in Active mode.
DS21981A-page 50
The device includes 8 Configuration registers, includ-
ing a Column Parity register and STATUS register. All
registers are readable and writable via SPI, except the
STATUS register, which is read-only. Bit 0 of each
register is a row parity bit (except for STATUS Register
7) that makes the register contents an odd number.
? 2005 Microchip Technology Inc.
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