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參數(shù)資料
| 型號(hào)： | FM3116 |
| 元件分類： | F-RAM |
| 英文描述： | 4Kb FRAM Serial 3V Memory |
| 中文描述： | 4Kb的鐵電串行3V的記憶 |
| 文件頁數(shù)： | 13/22頁 |
| 文件大小： | 170K |
| 代理商： | FM3116 |
FM3104/16/64/256
Rev 0.21
Nov 2003
Page 13 of 22
01h
/OSCEN
CAL/Control
D7
D6
D5
D4
D3
D2
D1
D0
OSCEN
/Oscillator Enable. When set to 1, the oscillator is halted. When set to 0, the oscillator runs. Disabling the
oscillator can save battery power during storage. On a power-up without battery, this bit is set to 1. Battery-
backed, read/write.
Reserved bits. Do not use. Should remain set to 0.
Calibration sign. Determines if the calibration adjustment is applied as an addition to or as a subtraction from
the time-base. Calibration is explained on page 7. Nonvolatile, read/write.
These five bits control the calibration of the clock. Nonvolatile, read/write.
Flags/Control
D7
D6
D5
D4
Reserved
CALS
CAL.4
CAL.3
CAL.2
CAL.1
CAL.0
Reserved
CALS
CAL.4-0
00h
D3
D2
D1
D0
Reserved
CF
Reserved
Reserved
Reserved
CAL
W
R
CF
Century Overflow Flag. This bit is set to a 1 when the values in the years register overflows from 99 to 00. This
indicates a new century, such as going from 1999 to 2000 or 2099 to 2100. The user should record the new
century information as needed. This bit is cleared to 0 when the Flag register is read. It is read-only for the user.
Battery-backed, read/write.
Calibration Mode. When set to 1, the clock enters calibration mode. When CAL is set to 0, the clock operates
normally, and the CAL/PFO pin is controlled by the power fail comparator. Read/write.
Write Time. Setting the W bit to 1 freezes updates of the user timekeeping registers. The user can then write
them with updated values. Setting the W bit to 0 causes the contents of the time registers to be transferred to the
timekeeping counters. Read/write.
Read Time. Setting the R bit to 1 copies a static image of the timekeeping core and place it into the user
registers. The user can then read them without concerns over changing values causing system errors. The R bit
going from 0 to 1 causes the timekeeping capture, so the bit must be returned to 0 prior to reading again.
Read/write.
Reserved bits. Do not use. Should remain set to 0.
CAL
W
R
Reserved
Two-wire Interface
The FM31xxx employs an industry standard two-
wire bus that is familiar to many users. This product
is unique since it incorporates two logical devices in
one chip. Each logical device can be accessed
individually. Although monolithic, it appears to the
system software to be two separate products. One is
a memory device. It has a Slave Address (Slave ID =
1010b) that operates the same as a stand-alone
memory device. The second device is a real-time
clock and processor companion which have a unique
Slave Address (Slave ID = 1101b).
By convention, any device that is sending data onto
the bus is the transmitter while the target device for
this data is the receiver. The device that is
controlling the bus is the master. The master is
responsible for generating the clock signal for all
operations. Any device on the bus that is being
controlled is a slave. The FM31xxx is always a slave
device.
The bus protocol is controlled by transition states in
the SDA and SCL signals. There are four conditions:
Start, Stop, Data bit, and Acknowledge. The figure
below illustrates the signal conditions that specify
the four states. Detailed timing diagrams are shown
in the Electrical Specifications section.
Stop
(Master)
Start
(Master)
7
Data bits
(Transmitter)
6
0
Data bit
(Transmitter)
Acknowledge
(Receiver)
SCL
SDA
Figure 8. Data Transfer Protocol
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FM3116-G | 功能描述:監(jiān)控電路 16K w/RTC Pwr Mon WDT Bat Sw PF RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| FM3116-GTR | 功能描述:監(jiān)控電路 16K w/RTC Pwr Mon WDT Bat Sw PF RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| FM3116S | 制造商:RAMTRON 功能描述: |
| FM3116-S | 功能描述:監(jiān)控電路 16K w/RTC Pwr Mon WDT Bat Sw PF RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| FM3116-STR | 功能描述:監(jiān)控電路 16K w/RTC Pwr Mon WDT Bat Sw PF RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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