L6470HTR STMicroelectronics, L6470HTR Datasheet - Page 26

• Manufacturer Part Number: L6470HTR
• Description: IC STEPPER/DC MOTOR DVR 28HTSSOP
• Manufacturer: STMicroelectronics

Specifications of L6470HTR

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-10812-2

Functional description
6.10
6.11
6.12
26/64
The overcurrent threshold can be programmed through the OCD_TH register in one of 16
available values ranging from 375 mA to 6 A with steps of 375 mA (see
9.1.17).
It is possible to set if an overcurrent event causes or not the MOSFETs turn-off (bridges in
high impedance status)acting on OC_SD bit in the CONFIG register (see paragraph 9.1.21).
The OCD flag in the STATUS register is raised anyway (see
Undervoltage lock-out (UVLO)
The L6470 provides a motor supply UVLO protection. When the motor supply voltage falls
below the V
GetStatus command is sent to the IC, and the undervoltage condition is expired, the UVLO
flag is released (see paragraphs
the motor supply voltage goes over the V
undervoltage condition no motion command can be performed. UVLO flag is forced low by
logic reset (power-up included) even if no UVLO condition is present.
Thermal warning and thermal shutdown
An internal sensor allows the L6470 to detect when the device internal temperature exceeds
a thermal warning or an overtemperature threshold.
When the thermal warning threshold (T
register is forced low (see paragraph 9.1.22) until the temperature decrease below T
and a GetStatus command is sent to the IC (see paragraphs
When the thermal shutdown threshold (T
shutdown condition: the TH_SD bit in the STATUS register is forced low, the power bridges
are disabled bridges in high impedance state and the HiZ bit in the STATUS register is
raised (see paragraph 9.1.22).
Thermal shutdown condition only expires when the temperature goes below the thermal
warning threshold (T
On exit from thermal shutdown condition the bridges are still disabled (HiZ flag high);
whichever motion command makes the device exiting from High Z state (HardStop and
SoftStop included).
Reset and standby
The device can be reset and put into standby mode through a dedicated pin. When
STBY\RST pin is driven low, the bridges are left open (High Z state), the internal charge
pump is stopped, the SPI interface and control logic are disabled and the internal 3 V
voltage regulator maximum output current is reduced to I
heavily reduces the power consumption. At the same time the registers values are reset to
default and all protection functions are disabled. STBY\RST input has to be forced low at
least for t
On exit from standby mode, as well as for IC power-up, a delay of up to t
given before applying a new command to allow proper oscillator and logic startup and a
delay of up to t
STBY,min
SthOff
cpwu
threshold voltage, STATUS register UVLO flag is forced low. When a
in order to ensure the complete switch to standby mode.
must be given to allow the charge pump startup.
j(WRN)
).
Doc ID 16737 Rev 2
9.1.22
j(WRN)
and 9.2.20). Undervoltage condition expires when
SthOn
j(OFF)
) is reached the TH_WRN bit in the STATUS
) is reached the device goes in thermal
threshold voltage. When the device is in
REG,STBY
Table
9.1.22
; as a result the L6470
33, paragraph 9.1.22).
and 9.2.20).
Table
logicwu
8, paragraph
must be
j(WRN)
L6470