ELM412
Electrical Characteristics
All values are for operation at 25°C and a 5V supply, unless otherwise noted. For further information, refer to note 1 below.
Characteristic
Minimum Typical
Maximum Units
Conditions
Supply Voltage, VDD
VDD rate of rise
3.0
5.0
5.5
V
see note 2
0.05
V/ms
VDD = 5V, see note 3
VDD = 3V, see note 3
Average Supply Current, IDD
1.0
2.4
2.4
mA
mA
0.60
Input low voltage
VSS
0.15 VDD
VDD
V
V
Input high voltage
Output low voltage
Output high voltage
Output Duty Cycle
Output series resistance
Frequency Accuracy
0.85 VDD
0.6
V
Current (sink) = 8.7mA
VDD - 0.7
470
V
Current (source) = 5.4mA
67
2200
2
%
W
%
see note 4
see note 5
Notes: 1. This integrated circuit is produced with a Microchip Technology Inc.’s PIC12C5XX as the core embedded
microcontroller. For further device specifications, and possibly clarification of those given, please refer to the
appropriate Microchip documentation.
2. This spec must be met in order to ensure that a correct power on reset occurs. It is quite easily achieved
using most common types of supplies, but may be violated if one uses a slowly varying supply voltage, as
may be obtained through direct connection to solar cells, or some charge pump circuits.
3. Internal IC current only. Does not include any piezo or other currents.
4. A series resistor must be used to limit the current peaks due to the relatively large capacitance (~50nF) of a
piezo element. Maximum size is determined by the desired volume level.
5. Frequency error is both supply and temperature dependent, typically as shown in Figure 1 below.
-6
fast
-4
-2
0
% Error
slow
+2
+4
+6
VDD = 5V
VDD = 3V
-40
0
40
80
Temperature (°C)
Figure 1. Average Frequency Error
3 of 4
ELM412DSB
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