Datasheet

ManualsBrandsLinear Technology ManualsBattery Charger ICsSuper Capacitor Backup Controller and System Monitor IC QFN

LTC3350

3350fc

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ctl_reg (0x17)

Control Register: Several Control Functions are grouped into this register.

BIT(S) BIT NAME DESCRIPTION

0 ctl_strt_capesr Begin a capacitance and ESR measurement when possible; this bit clears itself

once a cycle begins.

1 ctl_gpi_buffer_en A one in this bit location enables the input buffer on the GPI pin. With a zero in this

location the GPI pin is measured without the buffer.

2 ctl_stop_capesr Stops an active capacitance/ESR measurement.

3 ctl_cap_scale Increases capacitor measurement resolution by 100x, this is used when measuring

smaller capacitors.

15:4 – Reserved

num_caps (0x1A)

Number of Capacitors: This register shows the state of the CAP_SLCT1, CAP_SLCT0 pins. The value read in this register is the number of capacitors

programmed minus one.

VALUE CAPACITORS

0b00 1 Capacitor Selected

0b01 2 Capacitors Selected

0b10 3 Capacitors Selected

0b11 4 Capacitors Selected

chrg_status (0x1B)

Charger Status Register: This register provides real time status information about the state of the charger system. Each bit is active high.

BIT(S) BIT NAME DESCRIPTION

0 chrg_stepdown The synchronous controller is in step-down mode (charging)

1 chrg_stepup The synchronous controller is in step-up mode (backup)

2 chrg_cv The charger is

in constant voltage mode

3 chrg_uvlo The charger is in under

voltage lockout

4 chrg_input_ilim The charger is in input current limit

5 chrg_cappg The capacitor voltage is above power good threshold

6 chrg_shnt The capacitor manager is shunting

7 chrg_bal The capacitor manager is balancing

8 chrg_dis The charger is temporarily disabled for capacitance measurement

9 chrg_ci The charger is in constant current mode

10 – Reserved

11 chrg_pfo Input voltage is below PFI threshold

15:12 – Reserved

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