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参数资料
| 型号： | FM31T372-G |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO14 |
| 封装： | GREEN, MS-012, SOIC-14 |
| 文件页数： | 11/26页 |
| 文件大小： | 790K |
| 代理商： | FM31T372-G |
FM31T372/374/376/378-G
Rev. 1.1
Apr. 2011
Page 19 of 26
Selective (Random) Read
There is a simple technique that allows a user to
select a random address location as the starting point
for a read operation. This involves using the first
three bytes of a write operation to set the internal
address followed by subsequent read operations.
To perform a selective read, the bus master sends out
the slave address with the LSB set to 0. This specifies
a write operation. According to the write protocol,
the bus master then sends the address bytes that are
loaded into the internal address latch. After the
FM31T37x acknowledges the address, the bus master
issues a Start condition. This simultaneously aborts
the write operation and allows the read command to
be issued with the slave address LSB set to a 1. The
operation is now a read from the current address.
Read operations are illustrated below.
RTC /Companion Write Operation
All RTC and Companion writes operate in a similar
manner to memory writes. The distinction is that a
different device ID is used and only one byte address
is needed instead of two. Figure 16 illustrates a single
byte write to this device.
RTC/Companion Read Operation
As with writes, a read operation begins with the
Slave Address. To perform a register read, the bus
master supplies a Slave Address with the LSB set to
1. This indicates that a read operation is requested.
After receiving the complete Slave Address, the
FM31T37x will begin shifting data out from the
current
register
address
on
the
next
clock.
Auto-increment operates for the special function
registers as with the memory address. A current
address read for the registers look exactly like the
memory except that the device ID is different.
The FM31T37x contains two separate address
registers, one for the memory address and the other
for the register address. This allows the contents of
one address register to be modified without affecting
the current address of the other register. For example,
this would allow an interrupted read to the memory
while still providing fast access to an RTC register. A
subsequent memory read will then continue from the
memory address where it previously left off, without
requiring the load of a new memory address.
However, a write sequence always requires an
address to be supplied.
S
A
Slave Address
1
Data Byte
1
P
By Master
By FM31xxx
Start
Address
Stop
Acknowledge
No
Acknowledge
Data
Figure 14. Current Address Memory Read
S
A
Slave Address
1
Data Byte
1
P
By Master
By FM31xxx
Start
Address
Stop
Acknowledge
No
Acknowledge
Data
Data Byte
A
Acknowledge
Figure 15.
Sequential Memory Read
By FM31T37x
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FM31T372-GTR | 功能描述:F-RAM F-RAM 4K w/RTC RoHS:否 存储容量:512 Kbit 组织:64 K x 8 接口:SPI 工作电源电压:2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube 制造商:Cypress Semiconductor |
| FM31T374 | 制造商:RAMTRON 制造商全称:RAMTRON 功能描述:System Supervisor & Temperature Compensated RTC(TCXO) with Embedded Crystal |
| FM31T374-G | 功能描述:F-RAM F-RAM 16K w/RTC RoHS:否 存储容量:512 Kbit 组织:64 K x 8 接口:SPI 工作电源电压:2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube 制造商:Cypress Semiconductor |
| FM31T374-GTR | 功能描述:F-RAM F-RAM 16K w/RTC RoHS:否 存储容量:512 Kbit 组织:64 K x 8 接口:SPI 工作电源电压:2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube 制造商:Cypress Semiconductor |
| FM31T376 | 制造商:RAMTRON 制造商全称:RAMTRON 功能描述:System Supervisor & Temperature Compensated RTC(TCXO) with Embedded Crystal |
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