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參數(shù)資料
| 型號(hào)： | CDP68HC68T1MZ96 |
| 廠商： | Intersil |
| 文件頁(yè)數(shù)： | 3/23頁(yè) |
| 文件大小： | 0K |
| 描述： | IC RTC RAM/SPI SERIAL 20-SOIC |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 類型： | 時(shí)鐘/日歷 |
| 特點(diǎn)： | 警報(bào)器，閏年，方波輸出，監(jiān)視計(jì)時(shí)器 |
| 存儲(chǔ)容量： | 32B |
| 時(shí)間格式： | HH:MM:SS（12/24 小時(shí)） |
| 數(shù)據(jù)格式： | YY-MM-DD-dd |
| 接口： | SPI |
| 電源電壓： | 3 V ~ 6 V |
| 電壓 - 電源，電池： | 2.2 V ~ 6 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-SOIC W |
| 包裝： | 帶卷 (TR) |
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11
FN1547.8
October 29, 2007
VSYS
This input is connected to the system voltage. After the CPU
initiates power down by setting Bit 6 in the Interrupt Control
Register to “1”, the level on this pin will terminate power
down if it rises about 1.0V above the level at the VBATT input
pin after previously falling below VBATT +1.0V. When
power-down is terminated, the PSE pin will return high and
the Clock Output will be enabled. The CPUR output pin will
also return high. The logic level present at this pin at the end
of POR determines the CDP68HC68T1’s operating mode.
VBATT
The oscillator power source. The positive terminal of the
battery should be connected to this pin. When the level on
the VSYS pin falls below VBATT +1.0V, the VBATT pin will be
internally connected to the VDD pin. When the voltage on
VSYS rises a threshold above (1.0V) the voltage on VBATT,
the connection from VBATT to the VDD pin is opened. When
the “LINE” input is used as the frequency source, VBATT
may be tied to VDD or VSS. The “XTAL IN” pin must be at
VSS if VBATT is at VSS. If VBATT is connected to VDD, the
“XTAL IN” pin can be tied to VSS or VDD.
XTAL IN, XTAL OUT
These pins are connected to a 32,768Hz. 1.048576MHz,
2.097152MHz or 4.194304MHz crystal. If an external clock
is used, it should be connected to “XTAL IN” with ‘XTAL
OUT” left open.
VDD
The positive power-supply pin.
Clock Control Register
Start-Stop
A high written into this bit will enable the counter stages of
the clock circuitry. A low will hold all bits reset in the divider
chain from 32Hz to 1Hz. A clock out selected by Bit 0, Bit 1
and Bit 2 will not be affected by the stop function except the
1Hz and 2Hz outputs.
Line-XTAL
When this bit is set high, clock operation will use the
50-cycle or 60-cycle input present at the LINE input pin.
When the bit is low, the crystal input will generate the 1Hz
time update.
XTAL Select
One of 4 possible crystals is selected by value in these two
bits:
0 = 4.194304MHz
2 = 1.048576MHz
1 = 2.097152MHz
3 = 32,768Hz
50Hz to 60Hz
50Hz is selected as the line input frequency when this bit is
set high. A low will select 60Hz. The power-sense bit in the
Interrupt Control Register must be set low for line frequency
operation.
Clock Out
The three bits specify one of the 7 frequencies to be used as
the squarewave clock output:
0 = XTAL
4 = Disable (low output)
1 = XTAL/2
5 = 1Hz
2 = XTAL/4
6 = 2Hz
3 = XTAL/8
7 = 50Hz or 60Hz
XTAL Operation = 64Hz
All bits are reset by a power-on reset. Therefore, the XTAL is
selected as the clock output at this time.
Interrupt Control Register
Watchdog
When this bit is set high, the watchdog operation will be
enabled. This function requires the CPU to toggle the CE pin
periodically without a serial-transfer requirement. In the
event this does not occur, a CPU reset will be issued. Status
Register must be read before re-enabling watchdog.
Power-Down
A high in this location will initiate a power down. A CPU reset
will occur, the CLK OUT and PSE output pins will be set low
and the serial interface will be disabled.
Power Sense
This bit is used to enable the line input pin to sense a power
failure. It is set high for this function. When power sense is
selected, the input to the 50Hz to 60Hz prescaler is
disconnected. Therefore, crystal operation is required when
power sense is enabled. An interrupt is generated when a
power failure is sensed and the power sense and Interrupt
True bit in the Status Register are set. When power sense is
activated, a “0” must be written to this location followed by a
“1” to re-enable power sense.
XTAL
IN
22M
T1
XTAL
OUT
R
(
N
OTE
8)
CR
YST
AL
C2
10pF TO 40pF
C1
5pF TO 30pF
NOTES:
7. All frequencies recommended oscillator circuit. C1, C2 values
crystal dependent.
8. R is used for 32KHz operation only. 100k to 300k range as
specified by crystal manufacturer.
FIGURE 7. OSCILLATOR CIRCUIT
CDP68HC68T1
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