Product data

UJA1167 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 2 — 18 April 2014 18 of 60
NXP Semiconductors
UJA1167
Mini high-speed CAN system basis chip with Standby/Sleep modes &
watchdog
[1] Default value at power-up defined by setting of bits VEXTSUC (see Table 11).
[2] Default value at power-up defined by setting of bits V1RTSUC (see Table 8
).
[1] UJA1167TK/VX only; status will always be 00 in the UJA1167TK.
[2] Default value at power-up.
6.6 High voltage output (UJA1167TK) and external sensor supply
(UJA1167TK/VX)
Depending on the device version, pin 7 is a high voltage output (INH) or an external
sensor supply (VEXT).
In the UJA1167TK, the INH pin can be used to control external devices, such as voltage
regulators. Depending on the setting of bits VEXTC, pin INH will either be disabled (to
disable external devices) or at a battery-related HIGH level (to enable external devices) in
selected SBC operating modes (see Table 12
). To ensure external devices are not
disabled due to an overtemperature event, pin INH does not change state when the SBC
switches to Overtemp mode.
In the UJA1167TK/VX, the VEXT pin is a voltage output intended to supply external
components, delivering up to 30 mA at 5 V. Like INH, VEXT is also configured via bits
VEXTC in the V1 and INH/VEXT control register (Table 12
).
Table 12. V1 and INH/VEXT control register (address 10h)
Bit Symbol Access Value Description
7:4 reserved R -
3:2 VEXTC
[1]
R/W VEXT/INH configuration:
00 VEXT/INH off in all modes
01 VEXT/INH on in Normal mode
10 VEXT/INH on in Normal, Standby and Reset modes
11 VEXT/INH on in Normal, Standby, Sleep and Reset modes
1:0 V1RTC
[2]
R/W set V1 reset threshold:
00 reset threshold set to 90 % of V1 nominal output voltage
01 reset threshold set to 80 % of V1 nominal output voltage
10 reset threshold set to 70 % of V1 nominal output voltage
11 reset threshold set to 60 % of V1 nominal output voltage
Table 13. Supply voltage status register (address 1Bh)
Bit Symbol Access Value Description
7:3 reserved R -
2:1 VEXTS
[1]
R/W VEXT status:
00
[2]
VEXT voltage ok
01 VEXT output voltage below undervoltage threshold
10 VEXT output voltage above overvoltage threshold
11 VEXT disabled
0 V1S R/W V1 status:
0
[2]
V1 output voltage above 90 % undervoltage threshold
1 V1 output voltage below 90 % undervoltage threshold