LTC2970CUFD datasheet(19/36 Pages) LINER

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LTC2970/LTC2970-1

29701fc

OPERATIO

CH0_A_SERVO, CH1_A_SERVO: Voltage Servo Control

Registers – Read/Write

BIT(s)

SYMBOL

OPERATION

b[14:0]

Ch0_a_servo[14:0]

Ch1_a_servo[14:0]

During servo operation

Chn_a_idac[7:0] output current is

stepped to force Chn_a_adc[14:0]

code to equal target code stored in

Chn_a_servo[14:0].

2’s complement format, b[14] = sign

Default value is undeﬁned.

b[15]

Ch0_a_servo_en

Ch1_a_servo_en

0 = Chn_a servo disabled (default).

1 = Chn_a servo enabled.

CH0_A_IDAC, CH1_A_IDAC: IDAC Control/Data Registers –

Read/Write

BIT(s)

SYMBOL

OPERATION

b[7:0]

Ch0_a_idac[7:0]

Ch1_a_idac[7:0]

Chn_a IDAC data value.

b[8]

Ch0_a_idac_en

Ch1_a_idac_en

0 = VOUTn output tri-stated.

1 = VOUTn output enabled.

There are two ways to enable

VOUTn.

1) When Chn_a_idac_en is set

high with Chn_a_idac_con low,

the LTC2970 will perform a soft

connect. During a soft connect,

the VOUTn voltage buffer output

will not be connected to the VOUTn

pin until the internal algorithm

has servo’d the voltage at the

IDACn pin to match the VOUTn

pin voltage. Resolution is one

Chn_a_idac LSB.

2) When Chn_a_idac_en is

enabled with Chn_a_idac_con

high, the LTC2970 will perform

a hard connect. The VOUTn

voltage buffer will be immediately

connected to the VOUTn pin.

b[9]

Ch0_a_idac_con

Ch1_a_idac_con

0 = VOUTn is not enabled or

has been enabled but is not yet

connected to the output of the

CHn voltage buffer. (Default)

1 = VOUTn is enabled and has been

connected to the output of the

CHn voltage buffer.

See Chn_a_idac_en for additional

information.

b[10]

Ch0_a_idac_pol

Ch1_a_idac_pol

0 = Use this setting when

increasing VOUTn causes

(VINn_AP-VINn_AM) to decrease.

Inverting conﬁguration common

to DC/DC converters with external

feedback networks.

1 = Use this setting when

increasing VOUTn causes

(VINn_AP-VINn_AM) to increase.

Non-inverting conﬁguration

common to DC/DC converters

with trim pins.

b[11]

Ch0_a_idac_servo_repeat

Ch1_a_idac_servo_repeat

0 = During servo operation, servo

Chn_a until the measured result

is stable and matches the target

code.

1 = During servo operation,

continuously servo Chn_a to the

target code.

b[15:12] Reserved

Always Returns 0

CH0_A_IDAC_TRACK and CH1_A_IDAC_TRACK: IDAC Tracking

data and control registers – Read/Write

LTC2970-1 Only

BIT(s)

SYMBOL

OPERATION

b[7:0]

Ch0_a_idac_

track[7:0]

Ch1_a_idac_

track[7:0]

Final target value for of Chn_a_

idac[7:0]. During tracking, Chn_a_

idac[7:0] is incremented/decremented

by 1 until it is equal to this value.

b[8]

Ch0_a_idac_track_en

Ch1_a_idac_track_en

0 = inhibit tracking of Chn_a_idac[7:0].

1 = enable tracking of Chn_a_idac[7:0]

b[15:9]

Reserved

Always Returns 0

CH0_A_DELAY_TRACK and CH1_A_DELAY_TRACK: IDAC

Tracking delay register – Read/Write

LTC2970-1 Only

BIT(s)

SYMBOL

OPERATION

b[9:0]

Ch0_a_delay_track[9:0]

Ch1_a_delay_track[9:0]

Delay used to synchronize or offset

tracking events.

b[1510]

Reserved

Always Returns 0

4. Detailed I2C Command Register Descriptions

(Cont.)

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