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XT65/XT75 Hardware Interface Overview

6.2 Operating Temperatures

XT65_XT75_HO_v00.130 Page 30 of 67 2006-10-12

Confidential / Preliminary

6.2 Operating Temperatures

Table 12: Board temperature

Parameter Min Typ Max Unit

Automatic shutdown

Temperature measured on XT65/XT75 board

Temperature measured at battery NTC

Due to temperature measurement uncertainty, a tolerance on the stated shutdown thresholds may occur.

The possible deviation is in the range of ± 3°C at the overtemperature limit and ± 5°C at the undertem-

perature limit.

-30

-20

---

>+80

+60

°C

Table 13: Ambient temperature according to IEC 60068-2 (without forced air circulation)

Parameter Min Typ Max Unit

Operating temperature range -30 +25 +65 °C

Restricted operation (with VBATT ≤ 3,8V) +70 °C

Restricted operation

Restricted operation allows normal mode speech calls or data transmission for limited time until automatic

thermal shutdown takes effect. For operating the XT75/65 above an expected ambient temperatures of

75°C please contact Siemens Application Engineering. The duration of emergency calls is unlimited be-

cause automatic thermal shutdown is deferred until hang up.

--- +70 to

+85

°C

Table 14: Charging temperature

Parameter Min Typ Max Unit

Battery temperature for software controlled fast charging

(measured at battery NTC)

0 --- +45 °C

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 57 58

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