SI3201-FS datasheet(39/148 Pages) SILABS

39 / 148 page

Si3210/Si3211

Rev. 1.61

The power dissipation on the NPN bipolar transistor

driving the RING terminal can become large and may

require a higher power rating device. The non-tracking

mode of operation is required by specific terminal

equipment that, in order to initiate certain data

transmission modes, goes briefly on-hook to measure

the line voltage to determine whether there is any other

off-hook terminal equipment on the same line.

TRACK = 0 mode is desired since the regulator output

voltage has long settling time constants (on the order of

tens of milliseconds) and cannot change rapidly for

TRACK = 1 mode. Therefore, the brief on-hook voltage

measurement would yield approximately the same

voltage as the off-hook line voltage and cause the

terminal equipment to incorrectly sense another off-

hook terminal.

Figure 19. VTIP, VRING, and VBAT in the Forward Active State

Constant I Region

Constant V Region

LIM

RING

BAT

BATL

LOOP

TIP

TRACK=0

TIP - VRING|

Table 28. Associated Relevant DC-DC Converter Registers

Parameter

Range

Resolution

Location

DC-DC Converter Power-off

Control

N/A

DCOF

Direct Register 14

DC-DC Converter Calibration

Enable/Status

N/A

DCCAL

Direct Register 93

DC-DC Converter PWM Period

0 to 15.564 µs

61.035 ns

DCN[7:0]

Direct Register 92

DC-DC Converter Min. Off Time

(0 to 1.892 µs) + 4 ns

61.035 ns

DCTOF[4:0]

Direct Register 93

High Battery Voltage—VBATH

0 to –94.5 V

1.5 V

VBATH[5:0]

Direct Register 74

Low Battery Voltage—VBATL

0 to –94.5 V

1.5 V

VBATL[5:0]

Direct Register 75

VOV

0 to –9 V or

0 to –13.5 V

1.5 V

VMIND[3:0]

VOV

Indirect Register 41

Direct Register 66

Note: The ProSLIC uses registers that are both directly and indirectly mapped. A “direct” register is one that is mapped

directly. An “indirect” register is one that is accessed using the indirect access registers (direct registers 28 through

31).

SI3201-FS Datasheet(PDF) 39 Page - Silicon Laboratories

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