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參數(shù)資料
| 型號： | X5045M8I-4.5A |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數(shù)： | 16/20頁 |
| 文件大?。?/td> | 105K |
| 代理商： | X5045M8I-4.5A |
X5043/X5045
Characteristics subject to change without notice.
5 of 20
REV 1.1.2 5/29/01
www.xicor.com
Figure 4. VTRIP Programming Sequence
SPI Serial Memory
The memory portion of the device is a CMOS Serial
EEPROM array with Xicor’s block lock protection. The
array is internally organized as x8 bits. The device fea-
tures a Serial Peripheral Interface (SPI) and software
protocol allowing operation on a simple four-wire bus.
The device utilizes Xicor’s proprietary Direct Write
cell, providing a minimum endurance of 1,000,000
cycles and a minimum data retention of 100 years.
The device is designed to interface directly with the
synchronous Serial Peripheral Interface (SPI) of many
popular microcontroller families.
The device contains an 8-bit instruction register that
controls the operation of the device. The instruction
code is written to the device via the SI input. There are
two write operations that requires only the instruction
byte. There are two read operations that use the
instruction byte to initiate the output of data. The
remainder of the operations require an instruction byte,
an 8-bit address, then data bytes. All instruction,
address and data bits are clocked by the SCK input. All
instructions (Table 1), addresses and data are trans-
ferred MSB rst.
Clock and Data Timing
Data input on the SI line is latched on the first rising
edge of SCK after CS goes LOW. Data is output on the
SO line by the falling edge of SCK. SCK is static,
allowing the user to stop the clock and then start it
again to resume operations where left off. CS must be
LOW during the entire operation.
VTRIP Programming
Apply 5V to VCC
Decrement VCC
RESET pin
goes active?
Measured VTRIP
-Desired VTRIP
DONE
Execute
Sequence
Reset VTRIP
Set VCC = VCC Applied =
Desired VTRIP
Execute
Sequence
Set VTRIP
New VCC Applied
Old VCC Applied
(VCC = VCC–10mV)
Execute
Sequence
Reset VTRIP
Error
≤ -Emax
-Emax < Error < Emax
YES
NO
Error
≥ Emax
Emax = Maximum Desired Error
- Error
=
New VCC Applied
Old VCC Applied
- Error
=
Table 1. Instruction Set
Note:
*Instructions are shown MSB in leftmost position. Instructions are transferred MSB rst.
Instruction Name
Instruction Format*
Operation
WREN
0000 0110
Set the Write Enable Latch (Enable Write Operations)
WRDI
0000 0100
Reset the Write Enable Latch (Disable Write Operations)
RSDR
0000 0101
Read Status Register
WRSR
0000 0001
Write Status Register (Watchdog and Block Lock)
READ
0000 A8011
Read Data from Memory Array Beginning at Selected Address
WRITE
0000 A8010
Write Data to Memory Array Beginning at Selected Address (1 to 16 bytes)
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