E1466DAO-DIT Atmel, E1466DAO-DIT Datasheet - Page 3

• Manufacturer Part Number: E1466DAO-DIT
• Description: IC CLOCK 32KHZ DGTL-TRIM 8-PIN
• Manufacturer: Atmel
• Type: Clock ICr

Specifications of E1466DAO-DIT

• Frequency - Max: 32kHz
• Voltage - Supply: 1.1 V ~ 2.2 V
• Operating Temperature: -20°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP
• Frequency-max: 32kHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Output: -
• Input: -

3. Functional Description
3.1
3.2
4731D–CLOCK–09/07
Oscillator
Trimming Capacitors
An oscillator inverter with feedback resistor is provided to generate the 32768 Hz clock
frequency. Values for the fixed capacitors at OSCIN and OSCOUT are mask-selectable (see
note 3 of “Operating Characteristics”). Four capacitor pads, C1 to C4, enable the users to add
integrated trimming capacitors to OSCIN, providing 15 tuning steps.
A frequency variation of typically 4 ppm for each tuning step is obtained by bonding the capacitor
pads to OSCIN. As none of these pads are bonded, the IC is in an untrimmed state.
on page 6
Note:
Capacitor pads C1 to C4: 0 = open, 1 = connected to OSCIN
Combination C1 + C4 is redundant and therefore eliminated from the list
Table 3-1.
For applications which utilize this integrated trimming feature, Atmel will determine optimum val-
ues for the integrated capacitors COSCIN and COSCOUT.
C4
0
0
0
0
1
0
0
0
1
1
0
1
1
1
1
shows the trimming curve characteristic.
Frequency Trimming Table
C3
0
0
0
1
0
0
1
1
0
1
1
0
1
1
1
Capacitor Pads
C2
0
0
1
0
0
1
0
1
1
0
1
1
0
1
1
C1
0
1
0
0
0
1
1
0
0
0
1
1
1
0
1
Trimming Step
e1466D
10
11
12
13
14
Figure 6-1
0
1
2
3
4
5
6
7
8
9
3