參數(shù)資料
| 型號： | MCP4901-E/P |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 5/22頁 |
| 文件大小： | 0K |
| 描述： | DAC 8BIT SGL W/SPI 8PDIP |
| 標準包裝： | 60 |
| 設置時間： | 4.5µs |
| 位數(shù)： | 8 |
| 數(shù)據接口： | 串行，SPI? |
| 轉換器數(shù)目： | 1 |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 8-DIP（0.300"，7.62mm） |
| 供應商設備封裝： | 8-PDIP |
| 包裝： | 管件 |
| 輸出數(shù)目和類型： | 1 電壓，單極；1 電壓，雙極 |
| 采樣率（每秒）： | * |
| 產品目錄頁面： | 673 (CN2011-ZH PDF) |
MCP7940N
DS25010C-page 20
2011 Microchip Technology Inc.
6.2.2.3
Sequential Read
Sequential reads are initiated in the same way as a
random read except that after the MCP7940N
transmits the first data byte, the master issues an
Acknowledge as opposed to the Stop condition used in
a random read. This Acknowledge directs the
MCP7940N
to
transmit
the
next
sequentially
addressed 8-bit word (Figure 6-6). Following the final
byte transmitted to the master, the master will NOT
generate an Acknowledge but will generate a Stop
condition. To provide sequential reads, the MCP7940N
contains an internal Address Pointer which is
incremented by one at the completion of each
operation. This Address Pointer allows the entire
memory contents to be serially read during one
operation. The internal Address Pointer will automat-
ically roll over to the start of the Block.
FIGURE 6-5:
RANDOM READ
FIGURE 6-6:
SEQUENTIAL READ
BUS ACTIVITY
MASTER
SDA LINE
BUS ACTIVITY
A
C
K
N
O
A
C
K
A
C
K
A
C
K
S
T
O
P
S
T
A
R
T
CONTROL
BYTE
ADDRESS
BYTE
CONTROL
BYTE
DATA
BYTE
S
T
A
R
T
S 1 101
0
111
S 10 10
1
P
BUS ACTIVITY
MASTER
SDA LINE
BUS ACTIVITY
CONTROL
BYTE
DATA n
DATA n + 1
DATA n + 2
DATA n + X
N
O
A
C
K
A
C
K
A
C
K
A
C
K
A
C
K
S
T
O
P
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