Datasheet

ISD5100 SERIES
Publication Release Date: Oct 31, 2008
- 27 - Revision 1.42
5. Select the SUM2 SUMMING amplifier path through the VOLUME MUX—Bits VLS0 and VLS1
control the state VOLUME MUX. These bits are bits D14 and D15, respectively of CFG1. They
should be set to the state where D14 is ONE and D15 is ZERO to select the SUM2 SUMMING
amplifier.
6. Power up the VOLUME CONTROL LEVEL
—Bit VLPD controls the power-up state of the
VOLUME CONTROL attenuator. This is Bit D0 of CFG0. This bit must be set to a ZERO to
power-up the VOLUME CONTROL.
7. Select a VOLUME CONTROL LEVEL—Bits VOL0, VOL1, and VOL2 control the state of the
VOLUME CONTROL LEVEL. These are bits D11, D12, and D13, respectively, of CFG1. A
binary count of 000 through 111 controls the amount of attenuation through that state. In most
cases, the software will select an attenuation level according to the desires of the current
users of the product. In this example, we will assume the user wants an attenuation of –12 dB.
For that setting, D11 should be set to ONE, D12 should be set to ONE, and D13 should be set
to a ZERO.
8. Select the VOLUME CONTROL path through the OUTPUT MUX
—These are bits D3 and D4,
respectively, of CFG0. They should be set to the state where D3 is ZERO and D4 is a ZERO
to select the VOLUME CONTROL.
9. Power up the SPEAKER amplifier and select the HIGH GAIN mode
—Bits OPA0 and OPA1
control the state of the speaker (SP+ and SP–) and AUX OUT outputs. These are bits D1 and
D2 of CFG0. They must be set to the state where D1 is ONE and D2 is ZERO to power-up the
speaker outputs in the HIGH GAIN mode and to power-down the AUX OUT.
To set up the chip for Memo or Call Playback, the configuration registers are set up as follows:
CFG0=0010 0100 0010 0100 (hex 2424).
CFG1=0101 1001 1101 0001 (hex 59D1).
Only those portions necessary for this mode are powered up.
6.3.11 Message Cueing
Message cueing allows the user to skip through analog messages without knowing the actual physical
location of the message. This operation is used during playback. In this mode, the messages are
skipped 512 times faster than in normal playback mode. It will stop when an EOM marker is reached.
Then, the internal address counter will be pointing to the next message.