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FM31T376-G 参数 Datasheet PDF下载

FM31T376-G图片预览
型号: FM31T376-G
PDF下载: 下载PDF文件 查看货源
内容描述: 系统监控器和温度补偿实时时钟( TCXO )与内嵌晶体 [System Supervisor & Temperature Compensated RTC(TCXO) with Embedded Crystal]
分类和应用: 晶体电源电路电源管理电路石英晶振温度补偿晶振光电二极管监控时钟
文件页数/大小: 26 页 / 796 K
品牌: RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
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FM31T372/374/376/378-G  
F-RAM  
Array  
2-Wire  
Interface  
A1, A0  
SCL  
LockOut  
SDA  
LockOut  
Special  
Function  
Registers  
RST  
Watchdog  
LV Detect  
RTC Registers  
S/N  
FOUT  
PFI  
Temperature  
Compensated  
RTC  
Temp  
Sensor  
+
-
1.2V  
CAL/PFO  
512Hz  
32.768  
kHz  
/INT  
Event  
-
+
~2.4V  
CNT1  
CNT2  
Counters  
VDD  
Switched Power  
VBAK  
Battery Backed  
Nonvolatile  
Figure 1. Block Diagram  
Pin Descriptions  
Pin Name  
Type Pin Description  
A0, A1  
Input  
Device select inputs are used to address multiple memories on a serial bus. To select the device  
the address value on the two pins must match the corresponding bits contained in the device  
address. The device select pins are pulled down internally.  
CNT1, CNT2  
/INT  
Input  
Event Counter Inputs: These battery-backed inputs increment counters when an edge is detected  
on the corresponding CNT pin. The polarity is programmable. These pins should not be left  
floating. Tie to ground if pins are not used.  
Output Event Counter Driven Interrupt Output. This is a battery backed open-drain output. It goes low  
for at least 100 ms upon changes on either CNT1 or CNT2 pin. This pin can be left floating if  
not used.  
CAL/PFO  
FOUT  
Output In normal operation, this is the early power-fail output. In CAL mode, it supplies a 512 Hz  
square-wave output for clock calibration.  
Output 32.768kHz Clock Output. This is a battery backed open-drain output. This pin can be disabled  
by setting the FOEN bit to “0”. This pin can be left floating if not used.  
/RST  
SDA  
I/O  
I/O  
Active low reset output with weak pull-up. Also input for manual reset.  
Serial Data & Address: This is a bi-directional line for the two-wire interface. It is open-drain  
and is intended to be wire-OR‟d with other devices on the two-wire bus. The input buffer  
incorporates a Schmitt trigger for noise immunity and the output driver includes slope control  
for falling edges. A pull-up resistor is required.  
SCL  
Input  
Input  
Serial Clock: The serial clock line for the two-wire interface. Data is clocked out of the device  
on the falling edge, and into the device on the rising edge. The SCL input also incorporates a  
Schmitt trigger input for noise immunity.  
Early Power-fail Input: Typically connected to an unregulated power supply to detect an early  
power failure. This pin should not be left floating.  
PFI  
VBAK  
VDD  
Supply Backup supply voltage: A 3V battery or a large value capacitor. If no backup supply is used, this  
pin should be tied to VDD  
Supply Supply Voltage  
.
Rev. 1.1  
Apr. 2011  
Page 3 of 26  
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