![]() P2 - default short connection ROSC to 100kΩ resistance, that's means record duration is 10s Lead Out IO - VCC LED NC FT GND / VCC REC PLAYE PLAYL GND For normal operation of record, play and power down, the FT pin is held at Vss. TO operate this mode, the control pins REC, PLAYE and PLAYL are held LOW at Vss. The input FT controls the feed through mode. The signal between the MIC and MIC_REF pins will pass through the AGC, the filter and the speaker drivers to the speaker output SP+ and SP. The capacitor value, together with an internal 10KΩ resistance on this pin, determines the low-frequency cutoff for the 1800 passband.įT - Feed Through: This mode allows use of the speaker drivers for external signals. An external microphone should be AC coupled this pin via a series capacitor. An on-chip Automatic Gain Control (AGC) circuit controls the gain of the preamplifier. MIC - Microphone Input, the microphone input transfers its signals to the on-chip preamplifier. The SP+ pin and the SP- pin are internally connected through a 50KΩ resistance.When not in playback mode, they are floating. A single output may be used, but for direct-drive loud-speakers, the two opposite-polarity outputs provide an improvement in output power of up to four times over a single-ended connection will require an AC-coupling capacitor between the SP pin and the speaker. Speaker Outputs - The SP+ and SP- pins provide direct drive for loudspeakers with impedances as low as 8Ω. Holding this pin HIGH will increase standby current consumption. ![]() This pin has an internal pull-down device. The device automatically power down to standby mode when REC goes LOW. An End-of-Message(EOM) marker is internally recorded, enabling a subsequent playback cycle to terminate appropriately. A record cycles is completed when REC is pulled LOW. If REC is pulled HIGH during a playback cycle, the playback immediately ceases and recording begins. REC takes precedence over either playback(PLAYL or PLAYE) signal. This pin must remain HIGH for the duration of the recording. REC - The REC input is an active-HIGH record signal.The device records whenever REC is HIGH. Upon completion of the playback cycle, the device automatically power down into standby mode Take PLAY LOW during a playback cycle will not terminate the current cycle. PLAYE - Playback, Edge-activated:When a HIGH-going transition is detected on continues until an End-of-Message (EOM) marker is encountered or the end of the memory space is reached. The Voice Record Module of our provide default connect 100k resistor through P2 by short cap. If you want change record duration, an external resistor is necessary to select the record duration and sampling frequency, which can range from 8 - 20 seconds (4-12kHz sampling frequency). This module requires 3.3V DC to operate, DO NOT exceed the voltage out of this range, it may damage the module. ![]() Sample rate and duration changable by replacing a single resistor. ![]()
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