MAX14912 Datasheet, PDF (26/30 Pages) Maxim Integrated Products – Low Power and Heat Dissipation

MAX14912/MAX14913
Octal High-Speed, High-Side
Switch/Push-Pull Driver
Table 9. FAULT SUMMARY
FAULT NAME
Per-Channel Thermal
Shutdown (Note 17)
Global Thermal
Shutdown
Channel Open-Load
Detection
(If Enabled)
V_DD Undervoltage-
Lockout
V₅ Undervoltage-
Lockout
V_DD Warning
Watch-Dog
(If Enabled)
WHAT IT CHECKS
Temp (HS) > 170°C
or Temp (LS) > 170°C
Die-Center Temperature >
150°C
HS Mode Only.
HS On: Current < 2mA
HS Off: Current < 80µA
V_DD < V_{DD_UV}
V₅ < V_{V5_UV}
V_DD < V_{VDD_WARN}
Activity on CS:
Fault if no falling-edge for
more than 1.2s (or 600ms
or 200ms)
EFFECT ON FAULT
NAME
Single-channel HS and LS FAULT
are turned off immediately. (Note 18)
All channels HS and LS are
turned off.
FAULT
FAULT
PIN
BEHAVIOR
Pin goes low on any
fault;
if command-mode: pin
goes high when Z bit
is set,
else: pin goes high
when no faults
All channels HS and LS are
turned off; all LEDs off
UVLO
All channels HS and LS are
turned off; all LEDs off
Goes low
WDFLT
Goes high;
goes low at next CS
falling-edge
REG
BIT(S)
Reg 5
Reg 6 bit 3
Reg 4
Reg 6 bit 1
Reg 6 bit 2
Reg 6 bit 0
Reg 6 bit 7
No 8-Multiple CK
Pulses
Number of CK pulses
during a CS low period not SPI input data is discarded FAULT
a multiple of 8
Goes low on CS rise; Reg 6 bit 4
CRC Error Detection Received data does not
(If Enabled)
match the FCS word
SPI input data is discarded CERR
Goes high;
goes high on next CS
rise if fault does not
happen again
Reg 6 bit 6
Note 17: The HS or LS FETs are turned on/off according to the thermal protection signal generated by the analog circuit. On the
other hand, inside the logic circuit the thermal-protection signal is maintained high for at least 200ms (to filter out the
~10ms hysteretic cycling of the FET temperature).
Note 18: In command mode the FAULT pin behaves as an IRQ latched signal and can be cleared only by setting the Z bit to 1 (as
for any other fault register). In all other modes, FAULT is the logical OR of the real-time faults.
www.maximintegrated.com
Maxim Integrated │  26