LTC2972 datasheet(48/112 Pages) LINER

48 / 112 page

LTC2972

2972fa

For more information www.linear.com/LTC2972

Mfr_ee_data reads and writes must not be mixed.

MFR_EE_DATA Data Contents

BIT(S) SYMBOL

OPERATION

b[15:0] Mfr_ee_data[15:0] To read user space

1) Use the appropriate Mfr_ee_unlock sequence to configure for Mfr_ee_data commands with or without PEC.

2) Read Mfr_ee_data[0] = PackingId (MFR Specific ID).

3) Read Mfr_ee_data[1] = NumberOfUserWords (total number of 16-bit word available).

4) Read Mfr_ee_data[2] through Mfr_ee_data[NumberOfWord+1] (User EEPROM data contents).

To write user space

1) Initialize the user memory using the sequence described for the MFR_EE_ERASE command.

2) Use the appropriate Mfr_ee_unlock sequence to configure for Mfr_ee_data commands with or without PEC.

3) Write Mfr_ee_data[0] through Mfr_ee_data[NumberOfWord-1] (User EEPROM data content to be written).

The part will indicate it is busy erasing the EEPROM by the mechanism detailed below.

Response When Part Is Busy

The part will indicate it is busy accessing the EEPROM by the following mechanism:

1) Clearing Mfr_common_busyb of the MFR_COMMON register. This byte can always be read and will never NACK

a byte read request even if the part is busy.

2) NACKing commands other than MFR_COMMON.

MFR_EE Erase and Write Programming Time

The program time per word is typically 0.51ms and will require spacing the I2C/SMBus writes at greater than 0.51ms

to guarantee the write has completed. The Mfr_ee_erase command takes approximately 400ms. We recommend using

MFR_COMMON for handshaking.

PMBus COMMAND DESCRIPTION

INPUT VOLTAGE COMMANDS AND LIMITS

COMMAND NAME

CMD

CODE DESCRIPTION

TYPE

PAGED FORMAT UNITS EEPROM

DEFAULT

VALUE

REF

PAGE

VIN_ON

0x35

Input voltage above which power conversion can

be enabled.

R/W Word

L11

10.0

0xD280

VIN_OFF

0x36

Input voltage below which power conversion is

disabled. Both VOUT_ENn pins go off immediately

or sequence off after TOFF_DELAY

(See Mfr_config_track_enn).

R/W Word

L11

9.0

0xD240

VIN_OV_FAULT_LIMIT

0x55

Input overvoltage fault limit measured at

VIN_SNS pin.

R/W Word

L11

15.0

0xD3C0

VIN_OV_WARN_LIMIT

0x57

Input overvoltage warning limit measured at

VIN_SNS pin.

R/W Word

L11

14.0

0xD380

VIN_UV_WARN_LIMIT

0x58

Input undervoltage warning limit measured at

VIN_SNS pin.

R/W Word

L11

0x8000

VIN_UV_FAULT_LIMIT

0x59

Input undervoltage fault limit measured at

VIN_SNS pin.

R/W Word

L11

0x8000

LTC2972 Datasheet(PDF) 48 Page - Linear Technology

LTC2972 Datasheet(HTML) 48 Page - Linear Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL