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L3000 Datasheet(PDF) 8 Page - STMicroelectronics |
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L3000 Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 29 page The AC characteristic is just the resistance of the two serial resistors RP. In Stand-bymode the batterypolarity is just in direct condition,that is the TIP wire more positive than the RING one ; boost battery is not achievable. There are two possible line conditions where the SLIC is expected to be in stand-by mode : 1) ON-HOOK (Iline < 5mA). Normal on-hook condition. 2) OFF-HOOK (Iline > 7mA). Handset is unhooked, the SLIC is waiting for command to activate conversation. When the SLIC is in stand-by mode, the power dis- sipation of L3000S does not exceed 120mW (from -48V) eventually increased of a certain amount if some current is flowing into the line. The power dissipation of L3030 in the same condi- tion, is typically 120mW. The Stand-byMode is set when the byte sent to the L3030 Serial Digital Interface has the first two bits (BIT0R and BIT1R) equal to ”0”. Settingto 0 all the 8 bits of the command sent to the digital interface of L3030, the bias currents of both L3000S and L3030 are reduced and only some parts of the two circuits are active similarly to the stand-by mode ; in this situation, named power- down denial, the line sensors are disabled (ON/OFF-HOOK line conditions cannot be recogni- zed) and the current supplied to the line is limited at 0.25mA. Conversation (CVS) or Active Mode In conversationmodeit is possibleto selectbetween two different DC Characteristics by the BIT5R of the Serial Interface. 1) Normal Battery (NB) 2) Boost Battery (BB) It is also possibleto select(BIT4R)the polarity of the DC line voltage and (BIT6R-BIT7R) one of the four values of limiting current (25mA or 30mA or 45mA or 70mA). Battery reverse can take place either before or du- ring conversation. As far as the DC characteristic in Normal Battery is concerned, three different feeding conditions are present : a) current limiting region ; the DC impedance of the SLIC is very high (> 20 Kohm) and therefore the systemworkslike a currentgenerator,the current value being set through the digital interface (25/30/45/70mA). b) standard feeding system region ; the characteristic is equal to a – 48V (– 60V) battery (note 1), in series with two resistors, whose value is set by external components (see external component list of L3030). c) low impedance region ; the battery value is reducedto 33V (45V) and the serial resistance is reduced to the value specified in stand by mode, that is : 2 3 x (RFS + 2RP) Switching between the three region is automaticwi- thout discontinuity, and depends on the loop resi- stance.Fig. 2 shows the DC characteristic in normal battery condition. When the boostbatteryconditionis activatedthe low impedance region can never be reached by the sy- Figure 2 : DC Characteristic (n.b.) ILIM = 25/30/45/70mA. Note : 1. This value of voltage battery, named apparent battery, is fixed internally by the control unit and is independent of the actual battery value. So, the voltage drop in the low impedance region is 15V. It is also possible to increase up to 25V this value setting BIT3R to 1. L3000S - L3030 8/29 |
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