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参数资料
| 型号： | ISL1220 |
| 厂商： | Intersil Corporation |
| 英文描述： | Low Power RTC with 8 Bytes of Battery Backed SRAM and Separate FOUT(具有电池供电的8位SRAM和独立输出的低功率RTC) |
| 中文描述： | 低功耗RTC与8电池供电SRAM和独立的FOUT（具有电池供电的8位的SRAM和独立输出的低功率实时时钟字节） |
| 文件页数： | 12/20页 |
| 文件大小： | 328K |
| 代理商： | ISL1220 |
12
FN6315.0
June 22, 2006
NOTE: Writing to register 08h has restrictions. If V
BAT
>V
DD
, then no
byte writes to register 08h are allowed, only page writes beginning
with register 07h. If V
DD
>V
BAT
, then a byte write to register 08h IS
allowed, as well as page writes.
FREQUENCY OUT CONTROL BITS (FO <3:0>)
These bits enable/disable the frequency output function and
select the output frequency at the F
OUT
pin. See Table 4 for
frequency selection. If all bits are set to Zero, the F
OUT
function is disabled.
FREQUENCY OUTPUT BIT (FOBATB)
This bit enables/disables the F
OUT
pin during battery backup
mode (i.e. V
BAT
power source active). When the FOBATB is
set to “1” the F
OUT
pin is disabled during battery backup
mode. This means the frequency output function is disabled.
When the FOBATB is cleared to “0”, the F
OUT
pin is enabled
during battery backup mode. The F
OUT
pin is open drain
output and requires a pull up resistor to V
BAT
for operation in
battery backup mode
LOW POWER MODE BIT (LPMODE)
This bit enables/disables low power mode. With
LPMODE = “0”, the device will be in normal mode and the
V
BAT
supply will be used when V
DD
< V
BAT
- V
BATHYS
and
V
DD
< V
TRIP
. With LPMODE = “1”, the device will be in low
power mode and the V
BAT
supply will be used when
V
DD
< V
BAT
- V
BATHYS
. There is a supply current saving of
about 600nA when using LPMODE = “1” with V
DD
= 5V.
(See Typical Performance Curves: I
DD
vs V
CC
with
LPMODE ON AND OFF.)
ALARM ENABLE BIT (ALME)
This bit enables/disables the alarm function. When the ALME
bit is set to “1”, the alarm function is enabled. When the ALME
is cleared to “0”, the alarm function is disabled. The alarm
function can operate in either a single event alarm or a periodic
interrupt alarm (see IM bit).
NOTE: When the frequency output mode is enabled, the alarm function
is disabled.
INTERRUPT/ALARM MODE BIT (IM)
This bit enables/disables the interrupt mode of the alarm
function. When the IM bit is set to “1”, the alarm will operate
in the interrupt mode, where an active low pulse width of
250ms will appear at the IRQ pin when the RTC is triggered
by the alarm as defined by the alarm registers (0Ch to 11h).
When the IM bit is cleared to “0”, the alarm will operate in
standard mode, where the IRQ pin will be tied low until the
ALM status bit is cleared to “0”.
Analog Trimming Register
ANALOG TRIMMING REGISTER (ATR<5:0>)
Six analog trimming bits,
ATR0
to
ATR5
, are provided in
order to adjust the on-chip load capacitance value for
frequency compensation of the RTC. Each bit has a different
weight for capacitance adjustment. For example, using a
Citizen CFS-206 crystal with different ATR bit combinations
provides an estimated ppm adjustment range from -34 to
+80ppm to the nominal frequency compensation. The
combination of analog and digital trimming can give up to -94
to +140ppm of total adjustment.
The effective on-chip series load capacitance, C
LOAD
,
ranges from 4.5pF to 20.25pF with a mid-scale value of
TABLE 4. FREQUENCY SELECTION OF F
OUT
PIN
FREQUENCY,
F
OUT
UNITS
FO3
FO2
FO1
FO0
0
Hz
0
0
0
0
32768
Hz
0
0
0
1
4096
Hz
0
0
1
0
1024
Hz
0
0
1
1
64
Hz
0
1
0
0
32
Hz
0
1
0
1
16
Hz
0
1
1
0
8
Hz
0
1
1
1
4
Hz
1
0
0
0
2
Hz
1
0
0
1
1
Hz
1
0
1
0
1/2
Hz
1
0
1
1
1/4
Hz
1
1
0
0
1/8
Hz
1
1
0
1
1/16
Hz
1
1
1
0
1/32
Hz
1
1
1
1
IM BIT
INTERRUPT/ALARM FREQUENCY
0
Single Time Event Set By Alarm
1
Repetitive/Recurring Time Event Set By Alarm
FIGURE 11. DIAGRAM OF ATR
C
X1
X1
X2
CRYSTAL
OSCILLATOR
C
X2
ISL1220
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