- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄9397 > DS1374U-3+ (Maxim Integrated Products)IC RTC I2C W/CHARGER 10-USOP PDF資料下載
參數(shù)資料
| 型號： | DS1374U-3+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 5/18頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC RTC I2C W/CHARGER 10-USOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 類型： | 二進(jìn)制計數(shù)器 |
| 特點(diǎn)： | 警報器，方波輸出，涓流充電器，監(jiān)視計時器 |
| 時間格式： | 二進(jìn)制 |
| 數(shù)據(jù)格式： | 二進(jìn)制 |
| 接口： | I²C，2 線串口 |
| 電源電壓： | 2.7 V ~ 3.3 V |
| 電壓 - 電源，電池： | 1.3 V ~ 3.7 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 10-µMAX |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 1434 (CN2011-ZH PDF) |
DS1374
Status Register (08h)
Bit 7/Oscillator Stop Flag (OSF). A logic 1 in this bit
indicates that the oscillator either is stopped or was
stopped for some period of time and can be used to
judge the validity of the timekeeping data. This bit is set
to logic 1 any time the oscillator stops. The following
are examples of conditions that can cause the OSF bit
to be set:
1) The first time power is applied.
2) The voltage present on both VCC and VBACKUP are
insufficient to support oscillation.
3) The EOSC bit is turned off.
4) External influences on the crystal (i.e., noise, leak-
age, etc.).
This bit remains at logic 1 until written to logic 0.
Bit 0/Alarm Flag (AF). A logic 1 in the alarm flag bit
indicates that the WD/ALM counter reached zero. If
WD/ALM is set to zero and the AIE bit = 1, the INT pin
goes low and stays low until AF is cleared. AF is
cleared when written to logic 0. This bit can only be
written to logic 0. Attempting to write logic 1 leaves the
value unchanged. If WD/ALM is set to 1 and the AIE
bit = 1, the INT pin pulses low for 250ms when the
WD/ALM counter reaches zero and sets AF = 1. At the
pulse completion, the DS1374 clears the AF bit to zero.
If the 250ms pulse is active, writing AF to zero does not
truncate the pulse.
Trickle-Charge Register (10h)
The simplified schematic in Figure 7 shows the basic
components of the trickle charger. The trickle-charge
select (TCS) bits (bits 4–7) control the selection of the
trickle charger. To prevent accidental enabling, only a
pattern of 1010 enables the trickle charger. All other
patterns disable the trickle charger. The trickle charger
is disabled when power is first applied. The diode
select (DS) bits (bits 2, 3) select whether or not a diode
is connected between VCC and VBACKUP. If DS is 01,
no diode is selected; if DS is 10, a diode is selected.
The ROUT bits (bits 0, 1) select the value of the resistor
connected between VCC and VBACKUP. Table 5 shows
the resistor selected by the resistor select (ROUT) bits
and the diode selected by the diode select (DS) bits.
Warning: The ROUT value of 250
Ω must not be select-
ed whenever VCC is greater than 3.63V.
The user determines diode and resistor selection
according to the maximum current desired for battery or
super cap charging. The maximum charging current can
be calculated as illustrated in the following example.
Assume that a system power supply of 3.3V is applied
to VCC and a super cap is connected to VBACKUP. Also
assume the trickle charger has been enabled with a
diode and resistor R2 between VCC and VBACKUP. The
maximum current IMAX would therefore be calculated
as follows:
IMAX = (3.3V - diode drop) / R2
≈ (3.3V - 0.7V) / 2kΩ ≈
1.3mA
As the super cap changes, the voltage drop between
VCC and VBACKUP decreases and therefore the charge
current decreases.
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
OSF
00
AF
I2C, 32-Bit Binary Counter Watchdog RTC with
Trickle Charger and Reset Input/Output
____________________________________________________________________
13
TCS3
TCS2
TCS1
TCS0
DS1
DS0
ROUT1
ROUT0
FUNCTION
X
0
X
Disabled
X
1
X
Disabled
X
XXX0
0
Disabled
1
0
1
0
1
0
1
No diode, 250
Ω resistor
1
0
1
0
1
0
1
One diode, 250
Ω resistor
1
0
1
0
1
0
No diode, 2k
Ω resistor
1
0
1
0
1
0
1
0
One diode, 2k
Ω resistor
1
0
1
0
1
No diode, 4k
Ω resistor
1
0
1
0
1
0
1
One diode, 4k
Ω resistor
0
Power-on reset value
Table 5. Trickle Charge Register
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1308U-33+ | IC RTC 56BYTE NVRAM I2C 8UMAX |
| MAX5414EUD+ | IC DGTL POT DUAL 256-TAP 14TSSOP |
| DS1672U-3+ | IC TIMEKEEPER 3V 32-BIT 8-USOP |
| VE-J0N-MZ | CONVERTER MOD DC/DC 18.5V 25W |
| VI-JTR-MZ | CONVERTER MOD DC/DC 7.5V 25W |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1374U-3/T&R | 制造商:Maxim Integrated Products 功能描述:ELAPD TC 10PIN USOP 3.0 T&R - Tape and Reel |
| DS1374U-3+ | 功能描述:實(shí)時時鐘 I2C 32-Bit Binary Counter Watchdog RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1374U-3+T&R | 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 10USOP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC RTC I2C W/CHARGER 10-USOP 制造商:Maxim Integrated Products 功能描述:Real Time Clock I2C 32-Bit Binary Counter Watchdog |
| DS1374U-3+T&R | 功能描述:實(shí)時時鐘 I2C 32-Bit Binary Counter Watchdog RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1374U-33 | 功能描述:實(shí)時時鐘 I2C 32-Bit Binary Counter Watchdog RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。