LTC2970-1 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC2970-1' PDF : 36 Pages View PDF
U
OPERATIO
4. Detailed I2C Command Register Descriptions
(Cont.)
CH0_A_SERVO, CH1_A_SERVO: Voltage Servo Control
Registers – Read/Write
BIT(s) SYMBOL
OPERATION
b[14:0] Ch0_a_servo[14:0] During servo operation
Ch1_a_servo[14:0]
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
0 = Chn_a servo disabled (default).
Ch1_a_servo_en
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]
Chn_a IDAC data value.
Ch1_a_idac[7:0]
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.
b[9] Ch0_a_idac_con
Ch1_a_idac_con
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.
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.
LTC2970/LTC2970-1
b[10]
Ch0_a_idac_pol
Ch1_a_idac_pol
b[11]
Ch0_a_idac_servo_repeat
Ch1_a_idac_servo_repeat
b[15:12] Reserved
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.
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.
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 0 = inhibit tracking of Chn_a_idac[7:0].
Ch1_a_idac_track_en 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] Delay used to synchronize or offset
Ch1_a_delay_track[9:0] tracking events.
b[1510] Reserved
Always Returns 0
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