参数资料
型号: DS87C530-QCL
厂商: Maxim Integrated Products
文件页数: 3/45页
文件大小: 0K
描述: IC MCU EPR/ROM W/RTC 33MZ 52PLCC
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 23
系列: 87C
核心处理器: 8051
芯体尺寸: 8-位
速度: 33MHz
连通性: EBI/EMI,SIO,UART/USART
外围设备: 电源故障复位,WDT
输入/输出数: 32
程序存储器容量: 16KB(16K x 8)
程序存储器类型: OTP
RAM 容量: 1K x 8
电压 - 电源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振荡器型: 外部
工作温度: 0°C ~ 70°C
封装/外壳: 52-LCC(J 形引线)
包装: 管件
其它名称: DS87C530QCL
DS87C530/DS83C530 EPROM/ROM Microcontrollers with Real-Time Clock
11 of 45
automatically to occur once per second, once per minute, once per hour, or once per day. Enabling
interrupts with no match will generate an interrupt 256 times per second.
Software enables the timekeeper oscillator using the RTC enable bit in the RTC Control register (F9h).
This starts the clock. It can disable the oscillator to preserve the life of the backup energy-source if
unneeded. Values in the RTC Control register are maintained by the backup source through power failure.
Once enabled, the RTC maintains time for the life of the backup source even when VCC is removed.
The RTC will maintain an accuracy of
2 minutes per month at 25C. Under no circumstances are
negative voltages, of any amplitude, allowed on any pin while the device is in data retention mode
(VCC < VBAT). Negative voltages will shorten battery life, possibly corrupting the contents of internal
SRAM and the RTC.
Figure 2. Real-Time Clock
NONVOLATILE RAM
The 1k x 8 on-chip SRAM can be nonvolatile if an external backup energy source is used. This allows the
device to log data or to store configuration settings. Internal switching circuits will detect the loss of VCC
and switch SRAM power to the backup source on the VBAT pin. The 256 bytes of direct RAM are not
affected by this circuit and are volatile.
CRYSTAL AND BACKUP SOURCES
To use the unique functions of the DS87C530/DS83C530, a 32.768kHz timekeeping crystal and a backup
energy source are needed. The following describes guidelines for choosing these devices.
Timekeeping Crystal
The DS87C530/DS83C530 can use a standard 32.768kHz crystal as the RTC time base. There are two
versions of standard crystals available, with 6pF and 12.5pF load capacitance. The tradeoff is that the 6pF
uses less power, giving longer life while VCC is off, but is more sensitive to noise and board layout. The
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