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參數資料
| 型號： | MCP25055T-I/SL |
| 廠商： | Microchip Technology |
| 文件頁數： | 37/66頁 |
| 文件大小： | 0K |
| 描述： | IC I/O EXPANDER CAN 8B 14SOIC |
| 標準包裝： | 2,600 |
| 接口： | 1 線，CAN |
| 輸入/輸出數： | 8 |
| 中斷輸出： | 無 |
| 頻率 - 時鐘： | 4MHz |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 14-SOIC |
| 包裝： | 帶卷 (TR) |
| 包括： | ADC，存儲器，PWM |
| 其它名稱： | MCP25055TI/SL |
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MCP2502X/5X
DS21664D-page 42
2007 Microchip Technology Inc.
7.3.2
CONVERSION-ON-REQUEST
MODE
If the Conversion-on-request mode is selected, the
device performs an A/D conversion only after receiving
a Read A/D Registers or Read Register Receive
message (IRM). In the case of the Read A/D Registers
command, all of the GPIO pins that have been
configured as analog input channels will have an A/D
conversion done before the data frame is sent. When a
Read Register Receive message is initiated (extended
message format only), the A/D conversion is performed
when the MSB of the analog channel is requested, with
the MSB result being transferred. A subsequent read of
the LSB will transmit the value latched when the MSB
was requested (it is recommended that the Read A/D
Registers receive message is used to obtain complete
analog channel values in one message).
7.4
A/D Threshold Detection
Once an A/D auto-conversion has been completed, the
A/D channel result(s) can be compared to a value
stored in the associated A/D channel comparator
registers.
If the value in the analog channel result registers (i.e.,
AN0L and AN10H registers for analog channel 0) is
lower or higher than the value in the A/D comparator
registers (as specified by a corresponding polarity bit),
a transmit-on-change message will be sent (TXID2).
The
threshold-detection
function
for
all
analog
channels is bit-selectable.
If the A/D channel has been configured for transmit-on-
change mode, the MCP2505 will send a transmit
message with the appropriate data. It is possible that
more than one A/D channel has a change-of-state
condition. This does not pose a problem since all
analog channel data is provided in the transmit
message.
REGISTER 7-1:
A/D MODULE RESULT REGISTER MSB (ADRESNH)
REGISTER 7-2:
A/D MODULE RESULT REGISTER LSB (ADRESNL)
R-x
AD9
AD8
AD7
AD6
AD5
AD4
AD3
AD2
bit 7
bit 0
bit 7-0
AD9:AD2: Most Significant A/D Result bits
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
R-x
U-0
AD1
AD0
—
bit 7
bit 0
bit 7-6
AD1:AD0: Least significant A/D Result bits
bit 5-0
Unimplemented: Reads as ‘0’
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
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