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參數(shù)資料
| 型號(hào)： | DS1670E |
| 英文描述： | Portable System Controller |
| 中文描述： | 便攜式系統(tǒng)控制器 |
| 文件頁(yè)數(shù)： | 6/17頁(yè) |
| 文件大?。?/td> | 252K |
| 代理商： | DS1670E |
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DS1670
6 of 17
AIS0-AIS1 (Analog Input Select)
- These 2 bits are used to determine the analog input for the analog-to-
digital conversion. Table 2 lists the specific analog input that is selected by these two bits.
AIE (Alarm Interrupt Enable)
- When set to a logic 1, this bit permits the Interrupt Request Flag
(IRQF) bit in the status register to assert INT. When the AIE bit is set to logic 0, the IRQF bit does not
initiate the INT signal.
ANALOG INPUT SELECTION
Table 2
AIS1
0
0
1
1
AIS0
0
1
0
1
ANALOG INPUT
NONE
AIN0
AIN1
AIN2
STATUS REGISTER
BIT 7
BIT 6
CU
LOBAT
BIT 5
0
BIT 4
0
BIT 3
0
BIT 2
0
BIT 1
0
BIT 0
IRQF
CU (Conversion Update In Progress)
- When this bit is a 1, an update to the ADC Register (register
0Eh) will occur within 488 ms. When this bit is a 0, an update to the ADC Register will not occur for at
least 244 ms.
LOBAT (Low Battery Flag)
- This bit reflects the status of the backup power source connected to the
V BAT pin. When V
BAT
is greater than 2.5 volts, LOBAT is set to a logic 0. When V
BAT
is less than 2.3
volts, LOBAT is set to a logic 1.
IRQF (Interrupt Request Flag)
- A logic 1 in the Interrupt Request Flag bit indicates that the current
time has matched the time of day Alarm registers. If the AIE bit is
also a logic 1, the INT pin will go
high. IRQF is cleared by reading or writing to any of the alarm registers.
POWER-UP DEFAULT STATES
These bits are set to a one upon initial power-up:
EOSC, TD1 and TD0. These bits are cleared upon
initial power-up: WP, AIS1, and AIS0.
NONVOLATILE SRAM CONTROLLER
The DS1670 provides automatic backup and write protection for external SRAM. This function is
provided by gating the chip enable signals and by providing a constant power supply through the V
CCO
pin. The DS1670 was specifically designed with the Intel 80186 and 386EX microprocessors in mind.
As such, the DS1670 has the capability to provide access to the external SRAM in either byte-wide or
word-wide format. This capability is provided by the chip enable scheme. Three input signals and two
output signals are used for enabling the external SRAM(s) (see Figure 4).
CEI
(chip enable in),
BHE
(byte high enable), and
BLE
(byte low enable) are used for enabling either one or two external SRAMs
through the
CEOL
(chip enable low) and the
CEOH
(chip enable high) outputs. Table 3 illustrates the
function of these pins.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1670S | Portable System Controller |
| DS17285 | 3V/5V Real-Time Clock |
| DS17285-3 | 3V/5V Real-Time Clock |
| DS17285-5 | 3V/5V Real-Time Clock |
| DS17285E-3 | 3V/5V Real-Time Clock |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1670E/T&R | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 20TSSOP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC CTRLR SYSTEM PORTABLE 20TSSOP 制造商:Maxim Integrated Products 功能描述:Real Time Clock Portable System Controller |
| DS1670E/T&R | 功能描述:實(shí)時(shí)時(shí)鐘 Portable System Controller 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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 |
| DS1670E/TR | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Portable System Controller |
| DS1670E+ | 功能描述:實(shí)時(shí)時(shí)鐘 Portable System Controller 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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 |
| DS1670E+T&R | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 20TSSOP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC CTRLR SYSTEM PORTABLE 20TSSOP 制造商:Maxim Integrated Products 功能描述:Real Time Clock Portable System Controller |
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