|
|
PDF DS1670 Data sheet ( Hoja de datos )
| Número de pieza | DS1670 | |
| Descripción | Portable System Controller | |
| Fabricantes | Dallas Semiconductor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de DS1670 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
www.dalsemi.com
FEATURES
Provides real time clock:
− Counts seconds, minutes, hours, date of
the month, month, day of the week, and
year with leap year compensation valid up
to 2100
− Power control circuitry supports system
power-on from day/time alarm
Microprocessor monitor:
− Halts microprocessor during power fail
− Automatically restarts microprocessor
after power failure
− Monitors pushbutton for external override
− Halts and resets an out of control
microprocessor
NV RAM control:
− Automatic battery backup and write
protection to external SRAM
3-channel, 8-bit analog-to-digital converter
Simple 3-wire interface
3.3V operation
DS1670
Portable System Controller
PIN ASSIGNMENT
VBAT
VCCO
SCLK
I/O
CS
CEI
CEOL
CEOH
INT
GND
1
2
3
4
5
6
7
8
9
10
20 ST
19 VCC
18 X1
17 X2
16 AIN0
15 AIN1
14 AIN2
13 RST
12 BLE
11 BHE
20-Pin TSSOP (4.4mm)
20-Pin SOIC (300 mil)
Package Dimension Information can be found at:
http://www.dalsemi.com/datasheets/mechdwg.html
ORDERING INFORMATION
DS1670E 20-pin TSSOP
DS1670S 20-pin SOIC
DESCRIPTION
The Portable System Controller is a circuit, which incorporates many of the functions necessary for low
power portable products integrated into one chip. The DS1670 provides a Real Time Clock, NV RAM
controller, microprocessor monitor, and a 3-channel, 8-bit analog-to-digital converter. Communication
with the DS1670 is established through a simple 3-wire interface.
The Real Time Clock (RTC) provides seconds, minutes, hours, day, date, month, and year information
with leap year compensation. The RTC also provides an alarm interrupt. This interrupt works when the
DS1670 is powered by the system power supply or when in battery backup operation so the alarm can be
used to wake up a system that is powered down.
Automatic backup and write protection of an external SRAM is provided through the VCCO, CEOL , and
CEOH pins. The backup energy source used to power the RTC is also used to retain RAM data in the
absence of VCC through the VCCO pin. The chip-enable outputs to RAM ( CEOL and CEOH ) are
controlled during power transients to prevent data corruption.
1 of 17
122800
1 page  
www.DataSheet4U.com
DS1670
CLOCK, CALENDAR AND ALARM
The time and calendar information is accessed by reading/writing the appropriate register bytes. Note
that some bits are set to 0. These bits will always read 0 regardless of how they are written. Also note
that registers 0 Fh to 7 Fh are reserved. These registers will always read 0 regardless of how they are
written. The contents of the time, calendar, and alarm registers are in the Binary-Coded Decimal (BCD)
format.
The DS1670 can run in either 12-hour or 24-hour mode. Bit 6 of the hours register is defined as the
12- or 24-hour mode select bit. When high, the 12-hour mode is selected. In the 12-hour mode, bit 5 is
the AM/PM bit with logic 1 being PM. In the 24-hour mode, bit 5 is the second 10-hour bit (20-23
hours).
The DS1670 also contains a time of day alarm. The alarm registers are located in registers 07h to 0 Ah.
Bit 7 of each of the alarm registers are mask bits (see Table 1). When all of the mask bits are logic 0, an
alarm will occur once per week when the values stored in timekeeping registers 00h to 03h match the
values stored in the time of day alarm registers. An alarm will be generated every day when mask bit of
the day alarm register is set to 1. An alarm will be generated every hour when the day and hour alarm
mask bits are set to 1. Similarly, an alarm will be generated every minute when the day, hour, and minute
alarm mask bits are set to 1. When day, hour, minute, and seconds alarm mask bits are set to 1, an alarm
will occur every second.
TIME OF DAY ALARM BITS Table 1
ALARM REGISTER MASK BITS (BIT 7)
SECONDS MINUTES HOURS DAYS
1 1 11
0 1 11
0 0 11
0 0 01
0 0 00
Alarm once per second.
Alarm when seconds match.
Alarm when minutes and seconds match
Alarm when hours, minutes and seconds match.
Alarm when day, hours, minutes and seconds.
SPECIAL PURPOSE REGISTERS
The DS1670 has two additional registers (control register and status register) that control the real time
clock and interrupts.
CONTROL REGISTER
BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
EOSC WP AIS1 AIS0
0
0
0 AIE
EOSC (Enable oscillator) - This bit when set to logic 0 will start the oscillator. When this bit is set to a
logic 1, the oscillator is stopped and the DS1670 is placed into a low-power standby mode with a current
drain of less than 200 nanoamps when in battery back-up mode. When the DS1670 is powered by VCC,
the oscillator is always on regardless of the status of the EOSC bit; however, the real time clock is
incremented only when EOSC is a logic 0.
WP (Write Protect) - Before any write operation to the real time clock or any other registers, this bit
must be logic 0. When high, the write-protect bit prevents a write operation to any register.
5 of 17
5 Page 
www.DataSheet4U.com
DS1670
Data transfers can occur 1 byte at a time or in multiple-byte burst mode. After CS is driven high an
address is written to the DS1670. After the address, one or more data bytes can be read or written. For a
single-byte transfer 1 byte is read or written and then CS is driven low. For a multiple-byte transfer,
multiple bytes can be read or written to the DS1670 after the address has been written. Each read or write
cycle causes the register address to automatically increment. Incrementing continues until the device is
disabled. After accessing register 0Eh, the address wraps to 00h.
Data transfer for single-byte transfer and multiple-byte burst transfer is illustrated in Figures 7 and 8.
SINGLE-BYTE DATA TRANSFER Figure 7
CS
SCLK
A0 A1 A2 A3 A4
A5
A6
RD
WR
D0
D1
D2
D3 D4 D5 D6 D7
MULTIPLE-BYTE BURST TRANSFER Figure 8
CS
SCLK
I/O
ADDRESS
DATA
BYTE
BYTE 0
DATA
BYTE 1
DATA
BYTE N
11 of 17
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet DS1670.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| DS1670 | Portable System Controller | Dallas Semiconductor |
| DS1672 | Low Voltage Serial Timekeeping Chip | Dallas Semiconductor |
| DS1673 | Portable System Controller | Dallas Semiconductor |
| DS1677 | Portable System Controller | Dallas Semiconductor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |