Datasheet

LTC2970/LTC2970-1
5
29701fc
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
2
C Interface Timing Characteristics
f
SCL
Serial Clock Frequency (Note 6)
●
10 400 kHz
t
LOW
Serial Clock Low Period (Note 6)
●
1.3 μs
t
HIGH
Serial Clock High Period (Note 6)
●
0.6 μs
t
BUF
Bus Free Time Between Stop and Start (Note 6)
●
1.3 μs
t
HD,STA
Start Condition Hold Time (Note 6)
●
600 ns
t
SU,STA
Start Condition Setup Time (Note 6)
●
600 ns
t
SU,STO
Stop Condition Setup Time (Note 6)
●
600 ns
t
HD,DAT
Data Hold Time (LTC2970 Receiving Data)
Data Hold Time (LTC2970 Transmitting Data)
(Note 6)
●
0
300 900
ns
ns
t
SU,DAT
Data Setup Time (LTC2970 Receiving Data) (Note 6)
●
100 ns
t
SP
Pulse Width of Spike Suppressed (Note 6)
●
98 ns
t
SETUP_GPIO
GPIO_0 and GPIO_1 Setup Time GPIO_0 and GPIO_1 input setup time
prior to the 26th rising SCL of an IO()
I
2
C read. These inputs must be valid and
stable by this time to be returned in the
IO() read result. (Note 6)
●
2.5 μs
t
HOLD_GPIO
GPIO_0 and GPIO_1 Hold Time GPIO_0 and GPIO_1 input hold time
after the 26th rising SCL of an IO() I
2
C
read. These inputs must be held until
this amount of time has elapsed to be
returned in the IO() read result. (Note 6)
●
2.5 μs
t
OUT_GPIO
GPIO_0 and GPIO_1 Output Time GPIO_0 and GPIO_1 output delay after
the 35th rising SCL of an I
2
C write. These
outputs will become high impedance or
begin driving low by this time. (Note 6)
●
2.5 μs
Internal Timers
t
TIMEOUT_SMB
Stuck BUS Timer The LTC2970 will release the I
2
C bus and
terminate the current command if the
command is not completed before this
amount of time has elapsed.
24 32 39 ms
t
SETUP_ADC
ADC Channel Setup Time After selecting a new ADC channel, the
LTC2970 will wait this amount of time
to allow the analog input to settle before
beginning an ADC conversion.
304 μs
t
TIMEOUT_
SYNC
Tracking SYNC Failure Timer LTC2970-1 Only: The LTC2970-1 will
abort a pending SYNC() command if a
tracking command is not received before
this amount of time has elapsed.
255 ms
t
HOLD_TRACK
Tracking IDAC Disconnect Delay LTC2970-1 Only: After the tracking
algorithm asserts CPIO_CFG low, the
LTC2970-1 will delay disconnecting the
IDACs from the power supply feedback
nodes by this amount of time. Used while
tracking power supplies on.
32 ms