ISL12020MIRZ-T7A Intersil, ISL12020MIRZ-T7A Datasheet - Page 18

• Manufacturer Part Number: ISL12020MIRZ-T7A
• Description: IC RTC/CALENDAR TEMP SNSR 20DFN
• Manufacturer: Intersil
• Type: Clock/Calendarr

Specifications of ISL12020MIRZ-T7A

• Memory Size: 128B
• Time Format: HH:MM:SS (12/24 hr)
• Date Format: YY-MM-DD-dd
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AGING AND INITIAL ANALOG TRIMMING BITS
(IATR0<5:0>)
The Initial Analog Trimming Register allows +32ppm to
-31ppm adjustment in 1ppm/bit increments. This
enables fine frequency adjustment for trimming initial
crystal accuracy error or to correct for aging drift.
The ISL12020M has a preset Initial Analog Trimming
value corresponding to the crystal in the module. This
value is recalled on initial power-up and should
never be changed for best temperature
compensation performance, although the user
may change this preset value to adjust for aging
or board mounting changes if so desired.
IATR05
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
IATR04
18
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
TABLE 12. IATRO TRIMMING RANGE
IATR03
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
ISL12020M
IATR02
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
The IATR0 register should only be changed while the TSE
(Temp Sense Enable) bit is “0”.
Note that setting the IATR to the lowest settings
(-31ppm) with the default 32kHz output can cause the
oscillator frequency to become unstable on power-up.
The lowest settings for IATR should be avoided to insure
oscillator frequency integrity.
ADDR
TABLE 11. INITIAL AT AND DT SETTING REGISTER
0Bh
IDTR
IATR01
01
7
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
IDTR
00
6
IATR
05
5
IATR00
IATR
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
04
4
IATR
03
3
TRIMMING RANGE
IATR
02
2
February 11, 2010
+32
+31
+30
+29
+28
+27
+26
+25
+24
+23
+22
+21
+20
+19
+18
+17
+16
+15
+14
+13
+12
+11
+10
+9
+8
+7
+6
+5
+4
+3
+2
+1
-1
-2
-3
-4
-5
-6
-7
IATR
0
01
1
FN6667.4
IATR
00
0