TLC6C5712-Q1 Datasheet, PDF (12/68 Pages) Texas Instruments – 12-Channel, Full-Diagnostic, Constant-Current-Sink LED Driver

TLC6C5712-Q1
SLVSCO9A – AUGUST 2015 – REVISED AUGUST 2015
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7.3 Feature Description
7.3.1 Power-On Reset (POR)
The device supports two types of POR, start-up or UVLO POR and software POR, with software reset capability.
7.3.1.1 Start-Up or UVLO POR
When power is applied to V_CC, or when V_CC is undervoltage (V_CC < V_(POR)), an internal power-on reset (POR)
holds the TLC6C5712-Q1 device in a reset condition with the following conditions until V_CC reaches VPOR.
During RESET:
• The device cannot receive data.
• The SDO pin is held LOW, so the device cannot transmit data.
• The ERR open-drain output is pulled down.
During POR, communication between the controller and the device is lost. Any data transmitted during this
period is lost. The state machine inside the device is undefined. After POR, the reset status is released, the
TLC6C5712-Q1 registers and SPI state machine are re-initialized to default states (see the Default column in
Table 2). [POR_ERR_FLAG] is set to HIGH during start-up or UVLO POR.
7.3.1.2 Software POR
A software reset command (<SOFTWARE_POR>) resets all internal register settings to default values. The
command executes on a LATCH rising edge. All fault bits and diagnostic status are cleared and set to their
default values. The <SOFTWARE_POR> command also executes the RESET_STATUS] command. The
[POR_ERR_FLAG] bit in the <READ_STATUS0> register is set to HIGH on a software POR.
7.3.1.3 Reset POR
Either start-up or a UVLO POR or a software POR sets [POR_ERR_FLAG] to HIGH. when the device enters
POR status, the [POR_ERR_FLAG] bit is latched HIGH. To clear the [POR_ERR_FLAG], a RESET_POR
command must be issued.
If [POR_ERR_FLAG] is set either by start-up, UVLO, or software, and the device is not in any UVLO state,
[POR_ERR_FLAG] is latched and does not block any operation.
7.3.1.4 POR Masking
[POR_ERR_FLAG] reporting to the ERR output can be masked by the [POR_MASK] bit. If a POR event happens
when [POR_MASK] is set HIGH, POR events do not trigger the ERR̅ output, and [POR_ERR_FLAG] is set
HIGH.
Start-Up and
UVLO POR
SOFTWARE_POR
POR_MASK
POR_ERROR_FLAG
ERR
Other Faults
Figure 15. POR Error Report Topology
See the following addresses in Table 2: 61h, 62h, 63h, and A2h.
7.3.2 Error Feedback
The TLC6C5712-Q1 device supports an active-low open-drain output for error information through the ERR pin
for the MCU error-monitor interrupt. If any FLAG bit is set to HIGH in the <READ_STATUS0> register, and is not
masked by a corresponding mask bit in the <WRITE_ERROR_MASK> register, the ERR pin pulls low to indicate
an ERROR scenario. The MCU should immediately execute the error monitor routine.
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